The Collaborative International Dictionary of English v.0.48:

Monomerous \Mo*nom"er*ous\, a. [Gr. single; mo`nos alone + ?
   part.]
   1. (Bot.) Composed of solitary parts, as a flower with one
      sepal, one petal, one stamen, and one pistil.
      [1913 Webster]

   2. (Zool.) Having but one joint; -- said of the foot of
      certain insects.
      [1913 Webster]