ἐντός + εἰλέω
English translation (word)
English translation (etymon)
Ἔντερα. ἀπὸ τοῦ δι’ αὐτῶν ῥεῖν τὴν τροφὴν καὶ τὸ αὐτῆς περίττωμα· ἢ ἀπὸ τοῦ εἰλοῦσθαι· οἷον ἔντελα τὰ ἐντὸς εἰλούμενα. οὕτως Σωρανός.
Entera "intestine": from the fact that food flows through them as well as the surplus of it. Or from "to wind", the *entela, as it were, that which is winding (eiloumenon) inside (entos). This is what Soranus says
Etym. Gudianum, epsilon, p. 480 (Ὠρίωνος. Ἔντερα· παρὰ τὸ δι’ αὐτῶν ῥεῖν τὴν τροφήν· ἢ διὰ τὸ ἐντὸς ῥεῖν· ἢ παρὰ τὸ ἐντὸς εἰλεῖσθαι, ἔντελόν τι ὄν, τὸ ἐντὸς εἰλούμενον); Leo Medicus, De natura hominum 72 (ἔντερα δὲ λέγεται ἀπὸ τοῦ εἱλεῖσθαι, οἷον ἔντελα, τὰ ἐντὸς εἱλούμενα, ἢ δι’ αὐτῶν ῥεῖν τὰ τῆς τροφῆς περισσά); Etym. Magnum, Kallierges, p. 310 (Ἔντερα: Οἱονεὶ ἐνδότερά τινα ὄντα· ἀπὸ τοῦ δι’ αὐτῶν ῥεῖν τὰ ἀπὸ τῆς τροφῆς περιττώματα· ἢ παρὰ τὸ ἔνδον εἰλεῖσθαι)
Descriptive etymology: the intestine is named after its form. The etymology requires two formal manipulations: the change of the [l] into [r], which was backed by similar modifications due to liquid dissimilation, and the change of [ei] into [e], which could rely on cases like χείρ, χειρός but poetic χερός