‖n.; pl.Fenestræ [ L., a window. ] (Anat.) A small opening; esp., one of the apertures, closed by membranes, between the tympanum and internal ear. [ 1913 Webster ]
a. [ L. fenestratus, p. p. of fenestrare to furnish with openings and windows. ] 1. Having numerous openings; irregularly reticulated; as, fenestrate membranes; fenestrate fronds. [ 1913 Webster ]
2. (Zool.) Having transparent spots, as the wings of certain butterflies. [ 1913 Webster ]
n. 1. (Arch.) The arrangement and proportioning of windows; -- used by modern writers for the decorating of an architectural composition by means of the window (and door) openings, their ornaments, and proportions. [ 1913 Webster ]
2. (Anat.) The state or condition of being fenestrated. [ 1913 Webster ]