Umbrella

n. [It. ombrella, from ombra, Lat. umbra, a shade; Fr. ombrelle. Cf. Lat. umbella, a sun-shade, a parasol. See UMBEL.]

1. A shade, screen, or guard, carried in the hand for sheltering the person from the rays of the sun, or from rain or snow. It is formed of silk, cotton, or other cloth, extended on strips of whalebone, or other elastic material, inserted in, or fastened to, a rod or stick. See PARASOL. “Defended by the umbrella’s oily shed.” Gay.
2. (Zoöl.) The umbrella-like part of a jelly-fish or medusa. Dana.