The Collaborative International Dictionary of English v.0.48:

Papula \Pap"u*la\, n.; pl. Papul[ae]. [L.]
   [1913 Webster]
   1. (Med.) A pimple; a small, usually conical, elevation of
      the cuticle, produced by congestion, accumulated
      secretion, or hypertrophy of tissue; a papule. --Quain.
      [1913 Webster]

   2. (Zool.) One of the numerous small hollow processes of the
      integument between the plates of starfishes.
      [1913 Webster]