Bible Dictionaries
Octagon

Webster's Dictionary

(1):

(n.) A plane figure of eight sides and eight angles.

(2):

(n.) Any structure (as a fortification) or place with eight sides or angles.

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