French Plural Nouns: Beyond Just Adding -S

Good news: most French plurals just add a silent -s. Better news: the exceptions follow five clean patterns — including one list of seven words that every French child chants at school. Here’s the whole system.

The five patterns

The seven -oux words

French schoolchildren memorise them as a chant: bijoux, cailloux, choux, genoux, hiboux, joujoux, poux — jewels, pebbles, cabbages, knees, owls, toys, lice. Seven words, -x instead of -s, no logic, pure heritage. Learn the chant, own the exception.

The shape-shifters

• un œil → des yeux — the most dramatic plural in French
• monsieur → messieurs, madame → mesdames, mademoiselle → mesdemoiselles (the “my” inside pluralises!)
• le ciel → les cieux (poetic skies)

You can’t HEAR most plurals

Livre and livres sound identical — French plurals live in the article: le/la [lə/la] vs les [le], un/une vs des. That’s why articles are non-negotiable in French (as covered in the articles lesson) — drop them and the listener loses the number.

FAQ

Do French family names take an -s?

No — chez les Dupont, les Martin. The article goes plural, the name stays put. (Royal dynasties are the exception: les Bourbons.)

What happens to adjectives in the plural?

They agree too, with similar patterns (-al → -aux: des problèmes internationaux), and des often becomes de before them: de bons amis — details in adjective placement.

How do compound nouns pluralise?

By logic, piece by piece: nouns and adjectives inside them agree (des grands-parents), verbs and prepositions don’t (des ouvre-boîtes). When in doubt, the dictionary is honourable.

Full pattern tables with audio on the plural of nouns chart, and the other half of noun agreement in le or la?

Quick practice