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]WordNet (r) 3.0 (2006):
drupelet n 1: a small part of an aggregate fruit that resembles a drupe