tres-tine

from The Collaborative International Dictionary of English v.0.48

Tres-tine \Tres"-tine`\, n. [Cf. L. tris, tres, three, and E.
   tyne, tine, a prong.]
   The third tine above the base of a stag's antler; the royal
   antler.
   [Webster 1913 Suppl.]