/ Dictionary / Index D dilatant: Meaning and Definition of Find definitions for: di•lat•ant Pronunciation: (di-lāt'nt, dī-), [key] — adj. dilating; expanding. exhibiting an increase in volume on being changed in shape, owing to a wider spacing between particles. (of rock) exhibiting an increase in volume owing to rearrangement and recrystallization of constituent grains. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dilapidated dilatate Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language