Entry 1 sense Webster, 1913 Spongiose /(spŭn"jĭ*ōs`)/ · Spon·gi·ose · IPA 01 a. Somewhat spongy; spongelike; full of small cavities like sponge; as, spongious bones. 1. Somewhat spongy; spongelike; full of small cavities like sponge; as, spongious bones.