πλευρ-ά, ᾶς, ἡ,
= cross πλευρόν, rib, rare in sg., βοὸς π. Hdt. 4.64; παρὰ τὴν π. ἑκάστην Arist. HA 513b29: pl., ribs, Id. PA 654b35 .
2. pl., generally, side of a man or animal, ἄλλοτ’ ἐπὶ πλευρὰς κατακείμενος, ἄλλοτε δ’ αὖτε ὕπτιος Il. 24.10; of both sides, ἀνὰ πλευράς τε καὶ ὤμους 23.716; οὐρῇ δὲ πλευράς τε καὶ ἰσχία ἀμφοτέρωθεν μαστίεται 20.170, cf. Hes. Sc. 430, A. Pr. 71, Eu. 843 (lyr.): sg., also, of one side, S. OC 1260, Aj. 834, etc.; a side of beef, etc., PCair.Zen. 381.5 ( iii B.C., written πλερά ): the pl. form is v.l. in E. Hec. 826 .
II side, of things and places, νηὸς πλευραί Thgn. 513; χωρίου Pl. Sis. 388e; [ Πακτωλοῦ ] D.P. 833; of an army, αἱ π. τοῦ πλαισίου X. An. 3.4.22, cf. 28, Plu. Mar. 25, etc.; παρὰ π. τινὶ εἶναι Plb. 5.26.6; παρὰ π., opp. κατὰ κεφαλήν, IG 22.463.72
III Math., side of a triangle or other figure, Antipho Soph. 13, Pl. Ti. 53d, 54c, etc.: esp. side of a rectangle, ib. 36c: hence, one factor of any product, Id. Tht. 148a, Arist. Metaph. 1051a26, Euc. 7 Def. 17, etc. side of a square of cube, and root of a square of cubic number, Id. 8.11, 12, Theol.Ar. 11; κυβικὴ π. cube root, Ph. Bel. 52.4 . generator of a cone or cylinder, Archim. Sph.Cyl. 1.8, 12 .