Pronunciation: (ret"n-ak'yu-lum), [key]
—pl. -laPronunciation: (-lu). [key]
1. Anat., Zool.any of various small structures that hook, clasp, or bind other structures to move them or hold them in place.
2. Entomol.a bristle on the butterfly forewing that clasps to the frenulum of the hindwing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.