ἐγκύρτιον
From LSJ
εἰς πέλαγος σπέρµα βαλεῖν καὶ γράµµατα γράψαι ἀµφότερος µόχθος τε κενὸς καὶ πρᾶξις ἄκαρπος → throwing seeds and writing letters at sea are both a vain and fruitless endeavor
Spanish (DGE)
-ου, τό
conducto que forma codo u horquilla para explicar la respiración y la circulación διπλᾶ κατὰ τὴν εἴσοδον ἐγκύρτια ἔχον Pl.Ti.78b, cf. c, d, Gal.in Pl.Tim.17.2, 22.1.