A.stone used in building, described by Thphr.Lap.7 (where πόρος), Plin.HN36.132, as a kind of marble, like the Parian in colour and solidity, but lighter; but ἐπιχώριος π., of the local conglomerate of Olympia, Paus.5.10.2; πώρου cj. for πόρου in Gal. 6.57 (= Orib.5.1.4); cf. πώρινος λίθος: pl., of stone used for substructures, IG7.3073.9, al. (Lebad., ii B.C.); τῶν εἰς τὰν στοιβὰν π. ib.42(1).106i17 (Epid., iv B.C.); τῶν εἰς τὰ ἀντιθέματα π. τομᾶς ib. 71.
2. stalactite in caverns, Arist.Mete.388b26.
3. chalkstone, formed in the joints, Id.HA521a21, Dsc.5.93.
4. stone in the bladder, Hp.Nat.Hom.14, Ruf.Ren.Ves.13.
5. metaph., “πῶροι γῆς τὰ μάρμαρα” M.Ant.9.36.