Bible Dictionaries
Adamantine

Webster's Dictionary

(1):

(a.) Like the diamond in hardness or luster.

(2):

(a.) Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains.

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