Physical Chemistry. exhibiting an increase in volume on being changed in shape, owing to a wider spacing between particles.
Petrology. (of rock) exhibiting an increase in volume owing to rearrangement and recrystallization of constituent grains.
Origin: 1835–45; Related forms
< Latin dīlātant-
(stem of dīlātāns
), present participle of dīlātāre
; see -ant