The Collaborative International Dictionary of English v.0.48:

Minimus \Min"i*mus\, n.; pl. Minimi. [L. See Minim.]
   1. A being of the smallest size. [Obs.] --Shak.
      [1913 Webster]

   2. (Anat.) The little finger; the fifth digit, or that
      corresponding to it, in either the manus or pes.
      [1913 Webster]

   de minimis or de minimus a.of trifling consequence or
      importance; too insignificant to be worthy of concern; --
      a reference to the phrase de minimis non curat lex.

   de minimis non curat lex [Latin] The law does not concern
      itself with trifles; -- a principle of law, that even if a
      technical violation of a law appears to exist according to
      the letter of the law, if the effect is too small to be of
      consequence, the violation of the law will not be
      considered as a sufficient cause of action, whether in
      civil or criminal proceedings.
      [PJC]

WordNet (r) 3.0 (2006):

minimus
    n 1: the fifth digit; the little finger or little toe