drupelet

from WordNet (r) 3.0 (2006)

drupelet
    n 1: a small part of an aggregate fruit that resembles a drupe

from The Collaborative International Dictionary of English v.0.48

Drupel \Drup"el\, Drupelet \Drupe"let\, n. [Dim. of {Drupe}.]
   (Bot.)
   A small drupe, as one of the pulpy grains of the blackberry.
   [1913 Webster]