A.the watery or serous part of milk, whey, “ναῖον δ᾽ ὀρῷ ἄγγεα πάντα” Od.9.222 ; “ὀρὸν πίνων” 17.225, cf. Hp.Mul.1.29, Acut.2, Arist. HA521b27, al., Eust.1626.1, 1818.23.
2. the watery part or serum of the blood, Pl.Ti.83d.
4. σπερματικὸς ὀρός seminal fluid, Placit.5.23:—the form ὀρρός is f.l. in Hp. Il.cc., Arist. l.c., Ruf.Ren.Ves.14, etc.; the form οὐρός was coined by Nic. Th.708. (Cf. Skt. sarás, Adj. 'fluid', Lat. serum.)