n. 毫米

[机] 公厘

[ noun ]
a metric unit of length equal to one thousandth of a meter
<noun.quantity>

Millimeter \Mil"li*me`ter\, Millimetre \Mil"li*me`tre\, n. [F.
millim[`e]tre; milli- milli- + m[`e]tre. See 3d {Meter}.]
A lineal measure in the metric system, containing the
thousandth part of a meter; equal to .03937 of an inch. See
3d {Meter}.