How to Say "Millimeter" in French

millimètre

The French word for "millimeter" is millimètre.

millimètre is a metric unit of length equal to one thousandth of a meter.

How does it change in a sentence?

millimètre is a masculine noun. The plural form is millimètres.

While millimètre is used for precision, French speakers often use the phrase un poil (literally 'a hair') to describe a tiny, imprecise distance, similar to saying 'a hair's breadth' in English.
France is the birthplace of the metric system, which was established during the French Revolution to replace a chaotic web of thousands of different local units of length used across the country.
In French typography, a non-breaking space is often placed between the number and the unit mm to ensure they stay on the same line, a rule much more strictly enforced than in casual English writing.

De bout en bout, la molécule d'ADN mesure un millième de millième de millimètre. Un million d'hélices placées côte à côte tiendrait dans cette lettre : o.
From end to end, the DNA molecule measures a thousandth of a thousandth of a millimeter. A million helices placed side by side would fit in this letter: o.
This sentence is useful for illustrating the scale of a DNA molecule using the word millimètre.
Tatoeba #10582449 by carlosalberto, translation #10582429 by carlosalberto
Pourriez-vous réduire le dessin de quelques millimètres ?
Could you shrink the drawing by a few millimeters?
L'épaisseur de ce trait est de 0,1 millimètre.
The thickness of this line is 0.1 millimeter.
Le diamètre du fil est d'un millimètre.
The wire's diameter is one millimeter.
Il y a un millimètre d'écart.
There is a one millimeter gap.
Ce bijou est très petit, il fait un millimètre d'épaisseur.
This jewelry is very small, it is one millimeter thick.

Lucas and Léa are working on a delicate DIY project together.

Sources

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