Oillet
Pronunciation : Oil"let
Part of Speech : n.
Etymology : [See Eyelet.] (Arch.) (a) A small opening or loophole, sometimes circular, used in medi?val fortifications. (b) A small circular opening, and ring of moldings surrounding it, used in window tracery in Gothic architecture. [Written also oylet.]
Source : Webster's Unabridged Dictionary, 1913