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.

The umbrellalike disk, or swimming bell, of a jellyfish.

Any marine tectibranchiate gastropod of the genus
Umbrella, having an umbrella-shaped shell; – called also umbrella
shell.