/ Dictionary / Index A adamantane: Meaning and Definition of Find definitions for: ad•a•man•tane Pronunciation: (ad"u-man'tān), [key] — n. Chem. a white crystalline alicyclic hydrocarbon, CH, consisting of four fused cyclohexane rings, with the carbon atoms arranged as in the diamond lattice. Cf. amantadine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. adamant adamantine Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language