Odd plurals

What's the plural of "octopus"? There's more than one correct answer

Usually, plural English nouns are pretty straightforward. Just add an -s or -es, and you're done. However, there are more than a few odd ones out: words that change their vowels, acquire unexpected endings, or become almost unrecognizable. These irregular nouns are not random: they are linguistic leftovers from older forms of English and from the many languages that contributed to its vocabulary. Here's a list of 10 irregular plurals that are considerably more interesting than simply adding an -s.

While the plural of mouse looks like an exception today, it is actually a survivor from a much older way of forming plurals called i-mutation, common in Old English and many Germanic languages. It's the same process that gave us geese, feet, teeth, and lice, among others.

English eventually abandoned this system in favor of the -s and -es mechanism for building plurals, but these words survive as remnants of the old times.

Children is an interesting case of what linguists call double plurals: words that conserve two different marks of plurality in their construction.

The Old English word cild was pluralized as cildru originally, and eventually as childre. As the language evolved, speakers added the plural suffix -en (also found in words like oxen and brethren) to form the word children. In effect, the word accumulated two markers of plurality.

English normally has a strong tendency to simplify these cases, which makes the survival of the word children (instead of childs) especially remarkable.

Cactus is a good example of what happens when English borrows a word, but speakers can't quite decide whether to keep the original language's grammar. The word entered English from Latin, and the traditional Latin plural of cactus is _cacti.

_However, English has its own perfectly sensible way of making plurals, and that has produced the word cactuses. In modern English dictionaries, both words are accepted. Cacti sounds more traditional and is particularly common in botanical contexts, while cactuses sounds more natural to everyday speakers.

Few English plurals generate as much debate as octopus. You'll commonly encounter octopuses, octopi, and, more rarely, octopodes. So which one is correct?

The popular form octopi comes from the mistaken assumption that octopus is a Latin word ending in -us and should therefore form its plural with -i, just like cacti. In reality, the word comes from the Greek oktōpous, meaning "eight-footed." Following Classical Greek rules, the plural should be octopodes.

While octopodes is closer to the original Greek, it's only common in specialized discussions. For ordinary English, octopuses is the simplest and most widely accepted choice.

In Latin, the singular datum means something that has been given, and data is its plural. English borrowed both forms, particularly in scientific and academic writing, where the distinction has remained important for centuries.

Today, datum is much less common outside of specialized contexts. While in formal scientific writing data is often still treated as plural, in everyday use many speakers treat it as a singular mass noun, as in "The data is stored on the server." The plural has effectively become more widespread than its original singular.

Phenomenon is another Greek word whose traditional plural has survived intact. In Greek, phainomenon referred to something that appears or is observed, while phenomena was its plural. English borrowed the pair through Latin and preserved the Greek-style ending.

Unlike cactus, where English developed an alternative plural, phenomena remains firmly established in educated and technical writing. It is especially common in science, where researchers may discuss multiple natural phenomena.

Both brothers and brethren are perfectly valid plurals of brother. However, in a surprising twist, they took on different nuances: while brothers is used for male siblings ordinarily, brethren (the older form) survived mainly in religious, fraternal, and formal contexts.

Brethren was once a normal plural of brother, but as English developed, the regular -s plural became increasingly dominant. Rather than disappearing completely, the older form became specialized. That gives us a fascinating example of a word developing two different plurals that coexist because they acquired different meanings.

The word die, referring to a single numbered polyhedron (most commonly a cube) used in games, entered English through the Old French dé, while dice developed from the French plural dés.

While the distinction is still very much in use, the singular die is losing strength in everyday English, and dice is increasingly being treated as both a plural and a singular noun. In time, the singular form die may disappear from everyday English vocabulary.

People is an especially interesting plural because it didn't originally come from the same word as person. The two words have completely different Latin origins.

Person ultimately comes from Latin persona, meaning a person, character, or role. People comes from Latin populus, meaning a population or nation, passing into English through French. Over time, English speakers began using people as the ordinary plural of person, even though the two words had separate histories.

The regular plural persons still exists and is perfectly legitimate, particularly in legal and formal contexts when referring to a group of individuals. But in ordinary conversation, people has become overwhelmingly dominant.

Index has two established plurals, and the choice between them often depends on what you're talking about. Indexes is the ordinary English plural, while indices preserves the Latin form and is especially common in mathematics, science, and economics.

The Latin plural indices survived in specialized fields because scholars continued using Latin-derived terminology. Meanwhile, ordinary English speakers naturally applied the familiar -es ending and produced indexes. Both forms are now standard.

Watch what you order

No, German Chocolate Cake isn't German: Beware of misleading dish names

Image: Umesh Soni

If "puppy chows" are not dog snacks, "duck sauce" contains no duck whatsoever, and "German Chocolate Cake" is reportedly Texan… who is handing out these misleading dish names? Decidedly, some of the terms on this list might make you check with the waiter before you place your order. Let’s explore the stories behind unexpected food labels!

Image: Van Thanh

This might be good news: No ducks are harmed in the making of this popular takeout condiment! Duck sauce is a sweet-and-sour orange jelly often served with Chinese-American dishes.

It’s made from apricots, plums, or peaches, combined with sugar and vinegar. The name likely came about because it was invented as a match for crispy duck dishes in Chinese restaurants.

Image: Taria Camerino

English muffins look nothing like American muffins, do they? And, technically, they do not come from England either.

These breads were popularized in the US by Samuel Bath Thomas, a British immigrant who began selling his "toaster crumpets" in New York in the late 1800s. It was the American consumers who branded them as "English muffins."

Image: Logan Clark

Did you know that German Chocolate Cake was actually popularized in… Texas? It did not come from Germany. The name refers to Samuel German, an American baker who created the delicious dark baking chocolate for Baker’s Chocolate Company.

In the 50s, a Texas homemaker later used his chocolate in a layered coconut-pecan cake recipe, and newspapers spread it with that name.

Image: Jay Gajjar

There’s no duck in duck sauce, and there’s no rabbit in Welsh rabbits, or Welsh rarebit! It’s actually melted cheese sauce served on toasted bread. Sometimes it comes flavored with ale, mustard, or spices.

The term "Welsh rabbit" was a tongue-in-cheek jab, likely implying that cheese was the "poor man’s meat" in Wales.

Image: Alex Gorey

Definitely not oysters! There’s nothing oceanic about this dish. Rocky Mountain oysters are actually bull or sheep testicles, usually battered, deep-fried, and served as bar fare or at ranch festivals in the American West.

Image: Piotr Musioł

Don’t expect poultry when you order this South Asian specialty! Bombay duck is actually a type of dried fish, locally known as "bombil," long eaten along India’s western coast.

Why the name, then? Some theorize that it derived from the mail system that transported this food, the ‘Bombay Dak’ (which translates to Bombay Mail).

Image: Charles Chen

You may or may not know this, but some Midwestern states enjoy a homemade candy called "puppy chow." Contrary to what the name might imply, it is not meant for dogs!

They are usually made of cereal, chocolate, peanut butter, and powdered sugar. The same snack goes by other cute names, like "monkey munch" or "muddy buddies."

Image: Jolien Coryn

No bread and not "sweet." This dish has a grossly misleading name. Sweetbreads are the thymus or pancreas glands of young animals, prized in French cuisine for their delicate, tender texture.

The "sweet" refers to their mild flavor compared to other organ meats, while "bread" may stem from an old English word for "flesh."

Image: Sebastian Coman Photography

It turns out, "Scotch egg" is not Scottish at all. Some place the origins in London, while others point to Indian dishes like kofta as possible inspirations.

The dish is a hard or soft-boiled egg wrapped in sausage meat, breaded, and fried.

Image: Alexandra Tran

We all know what French toast means, but, just like French fries, the origins are disputed! This classic breakfast recipe is far more ancient and pan-European than the name implies.

Versions of egg-soaked bread fried in fat go back to ancient Rome, and have popped up across Europe for centuries under names like pain perdu in France or arme ritter in Germany.

Image: Priscilla Du Preez 🇨🇦

Hearing "mincemeat," most people imagine ground beef. But this pie filling doesn’t always involve minced beef, as it once did.

Traditional mincemeat once did contain actual minced beef or mutton mixed with dried fruits, spices, and suet. Over time, many chose to drop the meat content, but the name stayed.