The barbs of a perfect feather.
Radiating organs, or color-markings, of the radiates.
The movable limb of a sextant or other angular instrument.
A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.