Is the word mer masculine or feminine in french?

Some rules:

Nouns as things.

They have a fixed gender: masculine or feminine and can be detected by some rules.

a) MASCULINE

1. The noun ends in: -ier,-age, -as, -ement, -ament, -in, -is, -on, -oir, -eur.

Un encrier, le canotage, le platras, le chargement, le testament, le patin, un abattis, le coupon, le parloir, un compositeur.

2. Names of trees: le chêne, le pommier.

3. Names of metals: le fer, le cuivre, le soufre.

4. Languages: le roumain, le russe, le français.

5. Days, months, seasons; le mardi, le riant Avril, le printemps, un bel automne.

6. ending in -a: le cholera, le mimosa.

b) FEMININE

1. Nouns formed with suffixes which express action, acquiring the disease (-ade,-ie,-aine,-aison,-ande,-ence,-esse…

La baignade, la jalousie, la quinzaine, la livraison, la trahison, une offrande, la clémence, la richesse, la bonté, la morsure, la tuberculose.

2. Science: la chimie, la grammaire.

3. Religious holidays: la Saint-Jean, la Saint-Nicolas

Other chapters.

Nouns like names of beings.

The formation of the feminine gender by the derivation of masculine form.

Special forms for the two genders

Same form for both genders

Particular cases

- Homonym nouns with opposite gender

- Gender of names (Louis - Louise)

- Geographical names