Source : Webster's Revised Unabridged Dictionary (1913)

Geometer \Ge*om"e*ter\, n. [F. g['e]om[`e]tre, L. geometres,
   geometra, fr. Gr. gewme`trhs, fr. ge`a, gh^, the earth +
   me`tron measure. See {Meter} measure.]
   1. One skilled in geometry; a geometrician; a mathematician.
      --I. Watts.

   2. (Zo["o]l.) Any species of geometrid moth; a geometrid.

Source : WordNet®

geometer
     n : a mathematician specializing in geometry [syn: {geometrician}]