noun
millimetre
noun
1
A unit of length equal to one thousandth of a metre, abbreviated "mm".
"The screw is only two millimetres wide."
"It rained fifteen millimetres overnight."
How to Use Millimetre
Learner’s notesIn plain EnglishA small metric unit of length — a thousandth of a metre — used for precise measurements like screws, rainfall, or camera lenses.
UK vs US
Spelled "millimetre" in British English and "millimeter" in American English.
Word Forms
millimetres plural
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The screw is only two _____ wide.
Etymology
From French millimètre, from milli- ("one thousandth") plus metre.