Hypertext Webster Gateway: "Oillet"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Oillet \Oil"let\, n. [See {Eyelet}.] (Arch.)
(a) A small opening or loophole, sometimes circular, used in
medi[ae]val fortifications.
(b) A small circular opening, and ring of moldings
surrounding it, used in window tracery in Gothic
architecture. [Written also {oylet}.]
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