Source: The Collaborative International Dictionary of English v.0.48
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.
[1913 Webster]