Portoise

Por´toise


n.1.(Naut.) The gunwale of a ship.
To lower the yards a-portoise
to lower them to the gunwale.
To ride a portoise
to ride an anchor with the lower yards and topmasts struck or lowered, as in a gale of wind.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.