the GNU version of the Collaborative International Dictionary of English
adj. Resembling a sponge; soft and porous; porous.
The Century Dictionary and Cyclopedia
Having the form or structure of a sponge; poriferous, as a member of the Spongiæ; of or pertaining to the Spongiæ.
Sponge-like; spongy; soft, elastic, and porous, like an ordinary bath-sponge: noting various objects or substances not sponges.
Word Usage
"CJD results in the brain literally being turned into sponge-like, hole-filled tissue (the reason the disease is also known as spongiform encephalopathy)."