/ Dictionary / Index G genethlialogy: Meaning and Definition of Find definitions for: ge•neth•li•al•o•gy Pronunciation: ( ju-neth"lē-ol'u-jē, -al'-), [key] — n. Astrol. the science of calculating positions of the heavenly bodies on nativities. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. genethliac genetic Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language