demi-douzaine means “half-dozen” | MotiTan French Dictionary

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J'ai acheté une demi-douzaine d'œufs au marché.

I bought half a dozen eggs at the market.

A compact bundle containing six matching items, treated as one quantity.

douzaine: A quantity consisting of twelve items.
moitié: An amount equal to half the whole.
lot: Several items gathered into one set.

Désigne un groupe de six unités, correspondant à la moitié d'une douzaine.

The compound combines French demi, meaning half, with douzaine, a group of twelve, and douzaine comes from douze, meaning twelve.

In une demi-douzaine, demi comes before the noun and remains invariable, so the spelling is not une demie-douzaine.