/ Dictionary / Index A astatine: Meaning and Definition of Find definitions for: as•ta•tine Pronunciation: (as'tu-tēn" -tin), [key] — n. Chem. a rare element of the halogen family. Symbol: At; at. no.: 85. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astatine (Thesaurus) astatic galvanometer aster Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language