One who betrays a place, or body of men. An obsolete word.
TREFLE, Fr. Trefoil. A term used in mining, from the similarity of the figure to trefoil. The simple trefle has only two lodgments; the double trefle four; and the triple one six.
TREILLAGE, Fr. Any assemblage of wood which is laid cross-ways. Of which description are the palisadoes, &c. in gardens
TREILLIS, Fr. A general term for iron grating, &c. Such as is used for prisons.
Treillis, Fr. The method that is used in copying plans, &c. It consists of a certain arrangement of strait lines, which being measured at equal distances from one another, and crossed from right to left, represents a quantity of small equal squares. This arrangement or disposition of lines is used by painters, engravers, and engineers, in taking accurate copies of plans, &c. and is called by the French Treillis.
TREILLISER. To trellis. To furnish with a trellis.
TREMEAU, Fr. An ancient term in fortification. See [Mortar].
TRENCHANT. Sharp or cutting.
TRENCHES, in a siege, are ditches made by the besiegers, that they may approach more securely to the place attacked; on which account they are also called lines of approach. The tail of the trench is the place where it was begun, and its head is the place where it ends.
Trenches are also made to guard an encampment.