Lewis Short
ablūtĭo (noun F) : abluo
* A washing, cleansing, Macr. S. 3, 7.—Of baptism, cf. abluo, I. fin. (eccl. Lat.; in Plin. 13, 12, 23, § 74, the correct reading is adulatione; v. Sillig ad h. l.).
Charlton T. Lewis, Charles Short, A Latin Dictionary