From Japanese-English FreeDict Dictionary ver. 0.1:
鬆 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, す /sˈɯᵝ/ 1. (noun (common) (futsuumeishi))
Note: word usually written using kana alonecavity (in old root vegetables, tofu, metal casting, etc.), pore, hollow, bubble, blowhole 2. (nouns which may take the genitive case particle `no')
Note: word usually written using kana aloneporous, pithy, spongy