millimetre

n. metric unit of length equal to one thousandth of a meter

The millimetre (American spelling: millimeter, symbol mm) is a unit of length in the metric system, equal to one thousandth of a meter, which is the current SI base unit of length. The corresponding unit of area is the square millimetre and the corresponding unit of volume is the cubic millimetre.
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Noun
1. a metric unit of length equal to one thousandth of a meter
(synonym) millimeter, mm
(hypernym) metric linear unit
(part-holonym) centimeter, centimetre, cm
(part-meronym) micron, micrometer

n. millimeter, metric unit of length equal to one thousandth of a meter

adj. cross-section paper, graph paper

(n.)
A lineal measure in the metric system, containing the thousandth part of a meter; equal to .03937 of an inch. See 3d Meter.