Meaning of dilatant

di•lat•ant

Pronunciation: (di-lāt'nt, dī-), [key]
— adj.
  1. dilating; expanding.
  2. exhibiting an increase in volume on being changed in shape, owing to a wider spacing between particles.
  3. (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.