\Tres"-tyne`\, n. [L. tris, tres, three + E. tyne.]
(Zo["o]l.)
In the antler of a stag, the third tyne above the base. This
tyne appears in the third year. In those deer in which the
brow tyne does not divide, the tres-tyne is the second tyne
above the base. See Illust. under {Rucervine}, and under
{Rusine}.