decimetre

from WordNet (r) 3.0 (2006)

decimetre
    n 1: a metric unit of length equal to one tenth of a meter [syn:
         {decimeter}, {decimetre}, {dm}]

from The Collaborative International Dictionary of English v.0.48

Decimeter \Dec"i*me`ter\, Decimetre \Dec"i*me`tre\, n. [F.
   d['e]cim[`e]tre; pref. d['e]ci- tenth (fr. L. decimus) +
   m[`e]tre. See {Meter}.]
   A measure of length in the metric system; one tenth of a
   meter, equal to 3.937 inches.
   [1913 Webster]