Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.heat, make hot, “θέρον αὐγαὶ ἠελίου Λιβύην” A.R.4.1312; θέρων ἕλκος,= θεραπεύων, Nic.Th.687:—elsewh. only in Pass. θέρομαι , fut. Med. “θέρσομαι” Od.19.507: aor. 2 ἐθέρην (in Ep. subj. “θερέω” 17.23): poet. and later Prose, become hot or warm, “νήησαν ξύλα πολλά, φόως ἔμεν ἠδὲ θέρεσθαι” 19.64, cf. 507; ἐπεί κε πυρὸς θερέω at the fire, 17.23; θέρου warm your self, Ar.Pl.953; “ὁπόταν . . τις . . ποτὲ ῥιγῶν θέρηται” Pl. Phlb.46c; “εἶδον [Ἡράκλειτον] θερόμενον πρὸς τῷ ἰπνῷ” Arist.PA645a19: impf. “ἐθέροντο” Philostr.VA2.18, Alciphr.1.23; “θέρεσθαι πρὸς τὴν εἵλην” Luc.Lex.2: metaph., θέρεσθαι πυρί, of love, Call.Epigr.27, cf. APl. 4.167 (Antip. Sid.).

2. of things, become warm, “τὰ ψυχρὰ θέρεται” Heraclit. 126, cf. Archel. ap. Plu.2.954f; μὴ . . ἄστυ πυρὸς δηΐοιο θέρηται be burnt by fire, Il.6.331, cf. 11.667; melt, “ἁ πέτρα θρυπτομένα θέρεται” AP12.61. (g[uglide]her-, cf. θερμός, Lat. formus and prob. Engl. warm.）