Heraldry, a diminutive of an orle, usually held to be half the breadth thereof.

Tret, in Commerce, an allowance made for the waste or the dirt that may be mixed with any commodity; which commonly four pounds in every 104 pounds weight.

Treavannion's Island, one of the group called Queen Charlotte's Islands, in the South Pacific Ocean, discovered by Captain Carteret in 1767. Long. 163. 43. E. Lat. 10. 43. S.

Trevennen's Island, the most southern of the Marquesas Islands, in the South Pacific Ocean. Long. 220. 1. E. Lat. 9. 14. S.