Umbrella Definition

ŭm-brĕlə

umbrellas

noun

A screen or shade, usually of cloth stretched over a folding radial frame, carried for protection against the rain or sun.

Webster's New World

Something shaped like an umbrella.

The umbrella of a mushroom.

American Heritage

The gelatinous, rounded mass that makes up the major part of the medusa stage of most jellyfish and certain other cnidarians.

American Heritage

Something suggestive of this.

Webster's New World

Air cover, especially during a military operation.

American Heritage

Synonyms:

Other Word Forms of Umbrella

Singular:

umbrella

Plural:

umbrellas

Italian ombrella from Late Latin umbrella alteration (influenced by umbra shade) of Latin umbella parasol umbel

From American Heritage Dictionary of the English Language, 5th Edition
From Italian ombrella, umbrella (“an umbrella, sunshade"), dim. of ombra (“shade"), from Latin umbra (“shadow").

From Wiktionary