/ Dictionary / Index T transplacental: Meaning and Definition of Find definitions for: trans•pla•cen•tal Pronunciation: (trans"plu-sen'tl), [key] — adj. across or passing through the placenta. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: transplacental (Thesaurus) transpire transplanetary Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language