Lewis Short
(adjective) : trĭ-pēs, ĕdis, ter
* Having three feet, three-footed: mensa,Hor. S. 1, 3, 13: grabatus,Mart. 12, 32, 11: mulus natus,Liv. 40, 2, 4; 40, 45, 4.—Trop., of a man leaning on a staff, Maxim. 1, 219, de sene.
Charlton T. Lewis, Charles Short, A Latin Dictionary