The Collaborative International Dictionary of English v.0.48:

Pubes \Pu"bes\, n. [L., the hair which appears on the body at
   puberty, from pubes adult.]
   1. (Anat.)
      (a) The hair which appears upon the lower part of the
          hypogastric region at the age of puberty.
      (b) Hence (as more commonly used), the lower part of the
          hypogastric region; the pubic region.
          [1913 Webster]

   2. (Bot.) The down of plants; a downy or villous substance
      which grows on plants; pubescence.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pubes
    n 1: the lower part of the abdomen just above the external
         genital organs [syn: pubes, pubic region, loins]