Lewis Short
dēflŭvĭum (noun N) : id. (perh. only in Plin.).
* A flowing down, flowing off, Plin. 18, 29, 69, § 281: defluvia fontanea,Sol. 4, 4.
* A falling off or out: capilli, = alopecia,Plin. 28, 11, 46, § 163; 29, 6, 34, § 108; cf. capitis,id. 11, 39, 94, § 230; 22, 13, 15, § 34.
Charlton T. Lewis, Charles Short, A Latin Dictionary