FENESTRA
fenestra
(noun) a small opening covered with membrane (especially one in the bone between the middle and inner ear)
Source: WordNet® 3.1
Etymology
Noun
fenestra (plural fenestras or fenestrae)
(anatomy) An opening in a body, sometimes with a membrane.
Synonyms
• vestibular window, oval window (in reference to the human ear)
Anagrams
• Feenstra, fastener, refasten
Source: Wiktionary
Fe*nes"tra, n.; pl. Fenestræ. Etym: [L., a window.] (Anat.)
Definition: A small opening; esp., one of the apertures, closed by
membranes, between the tympanum and internal ear.
Source: Webster’s Unabridged Dictionary 1913 Edition