Bible Dictionaries
Trefoil

Webster's Dictionary

(1):

(n.) A charge representing the clover leaf.

(2):

(n.) Any plant of the genus Trifolium, which includes the white clover, red clover, etc.; - less properly, applied also to the nonesuch, or black medic. See Clover, and Medic.

(3):

(n.) An ornamental foliation consisting of three divisions, or foils.

Bibliography Information
Webster, Noah. Entry for 'Trefoil'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/trefoil.html. 1828.