serrācum or sarrācum ī, n
a heavy wagon, cart, dray (with two wheels and closed sides): serraco advehi: Serraco veniente, Iu.—As a constellation, the Wain, Wagon, Great Bear, Iu.
serrācum, v. sarracum. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.