Hypertext Webster Gateway: "gyron"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Gyron \Gy"ron\, n. [F. giron; of German origin. See {Gore} a
piece of cloth,] (Her.)
A subordinary of triangular form having one of its angles at
the fess point and the opposite aide 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.
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