/ Dictionary / Index H Haeckel: Meaning and Definition of Find definitions for: Haeck•el Pronunciation: (hek'ul), [key] 1834–1919, German biologist and philosopher of evolution. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: haeckel (Thesaurus) hae haem- Related Content Daily Word Quiz: sequester Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language