Vallecula n. : A groove; a fossa; as, the vallecula, or fossa, which separates the hemispheres of the cerebellum.

Vallecula n. : One of the grooves, or hollows, between the ribs of the fruit of umbelliferous plants.

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Taxonomy
Vallecula, free encyclopedia, valleculae, search, anatomic, crevice, depression, furrow, the human body, hemispheres of the brain, inferior surface, nail matrix, Etymology, Latin word, valles, diminutive, little valley, Dictionary.

Defination from the web:
valleculae in the human body, including one between the hemispheres of the brain, on the inferior surface of the ... "Vallecula" comes from the Latin word "valles", meaning "valley", and is in the diminutive form of the word, so a vallecula is literally a "little ...