The Collaborative International Dictionary of English v.0.48:

Caudicle \Cau"di*cle\, Caudicula \Cau*dic"u*la\, n. [Dim. of L.
   cauda tail, appendage.] (Bot.)
   A slender, elastic process, to which the masses of pollen in
   orchidaceous plants are attached.
   [1913 Webster]