Pronunciation: (fi-nes'tru), [key]
—pl. -traePronunciation: (-trē). [key]
1. Anat., Zool.a small opening or perforation, as in a bone, esp. between the middle and inner ear.
2. Entomol.a transparent spot in an otherwise opaque surface, as in the wings of certain butterflies and moths.
3. Archit.a windowlike opening.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.