Bible Dictionaries
Oillet

Webster's Dictionary

(1):

(n.) A small opening or loophole, sometimes circular, used in mediaeval fortifications.

(2):

(n.) A small circular opening, and ring of moldings surrounding it, used in window tracery in Gothic architecture.

Bibliography Information
Webster, Noah. Entry for 'Oillet'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​o/oillet.html. 1828.