fenestrule
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Fenestrule — Fe*nes trule, n. [L. fenestrula a little window, dim. of fenestra a window.] (Zo[ o]l.) One of the openings in a fenestrated structure. [1913 Webster] … The Collaborative International Dictionary of English
fenestrule — n. [L. dim. fenestra, window] (BRYOZOA) A small opening between branches of a fenestrate colony … Dictionary of invertebrate zoology
fenestrule — fe·nes·trule … English syllables