gyron

Century Dictionary and Cyclopedia

1. n. In heraldry, a bearing consisting of two straight lines drawn from any given part of the field and meeting in an acute angle in the fesse-point. It usually issues from the dexter chief, and is considered to occupy one half of the first quarter; but if otherwise, its position must be stated in the blazon.

Wiktionary

1. n. heraldry A triangular form having an angle at the fess point and the opposite side at the edge of the escutcheon.

GNU Webster's 1913

1. n. (Her.) A subordinary of triangular form having one of its angles at the fess point and the opposite side at the edge of the escutcheon. When there is only one gyron on the shield it is bounded by two lines drawn from the fess point, one horizontally to the dexter side, and one to the dexter chief corner.