late 14c., "pertaining to windows," from Old French fenestral, from fenestre "window," from Latin fenestra (see fenestration).
Entries linking to fenestral
fenestration n.
1870 in the anatomical sense, noun of action from Latin fenestrare, from fenestra "window, opening for light," a word perhaps from Etruscan (see defenestration). Meaning "arrangement of windows" as a design element in architecture is from 1846. Related: Fenestrated.