| Noun | 1. | vallecula - (anatomy) any furrow or channel on a bodily structure or part body part - any part of an organism such as an organ or extremity costal groove - groove between the ribs where the nerves and blood vessels are fissure - (anatomy) a long narrow slit or groove that divides an organ into lobes anatomy, general anatomy - the branch of morphology that deals with the structure of animals |