Fenestrule
Pronunciation : Fe*nes"trule
Part of Speech : n.
Etymology : [L. fenestrula a little window, dim. of fenestra a window.] (Zo?l.)
Definition : Defn: One of the openings in a fenestrated structure.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder