Furnished with a horn or horns, or something resembling a horn in its nature, use, position, or look: as, horned cattle; a horned lizard; the horned moon.
especially— In ornithology, having feathers regarding the head projecting like horns: as, the horned owl; a horned grebe.
In entomology, having one or more huge horn-like projections. See cut-under horn-bug
Mitered.
In heraldry, having horns: an epithet used whenever their tincture differs from that of all of those other animal.
How would you define horned?