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.]
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   1. (Anat.) A groove; a fossa; as, the vallecula, or fossa,
      which separates the hemispheres of the cerebellum.
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   2. (Bot.) One of the grooves, or hollows, between the ribs of
      the fruit of umbelliferous plants.
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