noun

millimeter

millimetre

The insect is only a few millimeters long.

The insect is only a few millimetres long.

((number)) millimetres ((long/wide/etc.)) a measure of length The insect is only a few millimetres long.

Synonyms: none

From Latin 'mille' (thousand) and 'meter'. It means 'one-thousandth of a meter'.

The prefix 'milli-' means 'one-thousandth'. It's the same 'milli-' as in 'millilitre'.

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