The Collaborative International Dictionary of English v.0.48:
Vallecula \Val*lec"u*la\, n.; pl. Valleculae. [NL., dim. fr. L. vallis, valles, a valley.] [1913 Webster] 1. (Anat.) A groove; a fossa; as, the vallecula, or fossa, which separates the hemispheres of the cerebellum. [1913 Webster] 2. (Bot.) One of the grooves, or hollows, between the ribs of the fruit of umbelliferous plants. [1913 Webster]