Lewis Short
Abătŏs (noun F) : ˝Αβατος (inaccess (ble)
* A rocky island. in the Nile, not far from Philae, to which the priests only had access, Luc. 10, 323 (in Sen. Q. N. 4, 2, 7, written as Greek, Ἄβατος).
Charlton T. Lewis, Charles Short, A Latin Dictionary