Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Chemistrycalcifycal‧ci‧fy /ˈkælsɪfaɪ/ verb (calcified, calcifying, calcifies) [intransitive, transitive] HARD technical to become hard, or make something hard, by adding lime→ See Verb tableOrigin calcify (1800-1900) Latin calx; → CHALK1 ldoceonline.com