11 irregular plural words that sound completely wrong – but aren’t

We all know irregular plurals like “geese” and “mice.” But have you ever heard of “beeves” or “sphinges”? Laugh yourself stupid with our smart grammar quiz.

The plural of beef is… beeves! This is true only for “beef” in the sense of “cow”; If you’re talking about arguments between whiny celebrities on Twitter, then those are beefs.

On top of trying to memorise these irregular plurals, you’ve probably been getting these words wrong the whole time.

The plural of opus is… opera! (So, an opera is more than one opus? Mind blown.) What a crazy irregular plural!

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The plural of sphinx is… sphinges! (Though “sphinxes” is an acceptable secondary option.)

The irregular plural of biceps is… bicepses! That’s right: “biceps” is a singular word, literally translated from the Latin for “two-headed” (each of your biceps connects to the upper arm via two heads, one short and one long.)

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The plural of cul-de-sac is… culs-de-sac. In French, cul-de-sac literally translates to “bottom of a sack.” So, weirdly, the plural culs-de-sac becomes “Bottoms of a sack.” (That sack’s got back!)

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The plural, gender neutral form of nieces and nephews is… niblings! Yes, it was only coined in 1951 – all the more reason to make sure it doesn’t disappear!

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The irregular plural of attorney general is… attorneys general! Similarly, see also: postmasters general, mothers-in-law, and coups d’etat.

The plural of octopus is… octopuses! No – NOT octopi. Here’s the deal: “Octopi” is how you would make the word plural in Latin; unfortunately, “octopus” is not a Latin word – it’s Greek. The Greek way to make octopus plural is “Octopodes.” So, why don’t we say that? Because, linguists say, when you add a word to the English lexicon, you give all forms of the word an English inflection. So, octopus becomes octopuses. Silly as it sounds, stick with that.

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The plural of lasagna is… lasagne! It refers to the large, flat pasta as well as the dish itself; technically, you should be ordering the lasagne from your favourite Italian restaurant.