[1] Accusative plural of the headword, apparently (cf. sigma 937, sigma 938); Bernhardy suggested the genitive singular σπήλυγγος "fissure of a cave", and Kuster agreed. Gaisford compared pi 1506.
[2] This and its variant ῥωγάς are nouns related to the verb ῥήγνυμι ; cf. rho 242.