1. κεραΐς · kerais — Beekes
κεραΐς [] “black radish’, acc. to Thphr. a medical name of the wild radish, ῥάφανος ἀγρία. 674 κερᾶϊς eVAR Only acc. xepaiv (Thphr. HP 9, 15, 5; cerain Plin. HN 19, 82); the accent given by Frisk is probably wrong. *ETYM The agreement with the Slavic word for ‘horse-radish, Cochlearia Armoracia’ (eg. Ru. xren, Cz. kfen) is due to a loan from a common source. See SchraderNehring 1917(2): 55. — [Beekes, s.v. κεραΐς, p. 720]
2. κερᾶϊς · kerais — Beekes
κερᾶϊς [f.] ‘a small bird’ (Lyc. 1317). <1E? *kerh,-u- ‘horn’> eVAR Acc. -ida *ETYM Acc. to the sch., the name of a small bird that was put beside Medea in the passage cited. The gloss κεραΐς: κορώνη (H.) also refers to this. Originally a feminine of κεραός ‘horned’, and therefore a bird of the Bucerotidae, says Frisk. However, note that this pre-form would have to yield a short -a-, while DELG gives a long a (s.v. … — [Beekes, s.v. κερᾶϊς, p. 721]