millimetre

from WordNet (r) 3.0 (2006)

millimetre
    n 1: a metric unit of length equal to one thousandth of a meter
         [syn: {millimeter}, {millimetre}, {mm}]

from 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]