\Um*brel"la\, n. [It. umbrella, fr. ombra a shade, L.
umbra; cf. L. umbella a sunshade, a parasol. Cf. {Umbel},
{Umbrage}.]
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
   fabric, extended on strips of whalebone, steel, or other
   elastic material, inserted, or fastened to, a rod or stick
   by means of pivots or hinges, in such a way as to allow of
   being opened and closed with ease. See {Parasol}.
         Underneath the umbrella's oily shed.  --Gay.
2. (Zo["o]l.) The umbrellalike disk, or swimming bell, of a
   jellyfish.
3. (Zo["o]l.) Any marine tectibranchiate gastropod of the
   genus {Umbrella}, having an umbrella-shaped shell; --
   called also {umbrella shell}.
{Umbrella ant} (Zo["o]l.), the sauba ant; -- so called
   because it carries bits of leaves over its back when
   foraging. Called also {parasol ant}.
{Umbrella bird} (Zo["o]l.), a South American bird
   ({Cephalopterus ornatus}) of the family {Cotingid[ae]}. It
   is black, with a large handsome crest consisting of a mass
   of soft, glossy blue feathers curved outward at the tips.
   It also has a cervical plume consisting of a long,
   cylindrical dermal process covered with soft hairy
   feathers. Called also {dragoon bird}.
{Umbrella leaf} (Bot.), an American perennial herb
   ({Dyphylleia cymosa}), having very large peltate and lobed
   radical leaves.
{Umbrella shell}. (Zo["o]l.) See {Umbrella}, 3.
{Umbrella tree} (Bot.), a kind of magnolia ({M. Umbrella})
   with the large leaves arranged in umbrellalike clusters at
   the ends of the branches. It is a native of Pennsylvania,
   Virginia, and Kentucky. Other plants in various countries
   are called by this name, especially a kind of screw pine
   ({Pandanus odoratissimus}).