The Collaborative International Dictionary of English v.0.48:

Silicle \Sil"i*cle\, n. [L. silicula, dim. of siliqua a pod or
   husk: cf. F. silicule.] (Bot.)
   A seed vessel resembling a silique, but about as broad as it
   is long. See Silique.
   [1913 Webster]

WordNet (r) 3.0 (2006):

silicle
    n 1: short broad silique occurring in some cruciferous plants