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subumbrella

[suhb-uhm-brel-uh]
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noun Zoology.
  1. the concave undersurface of a coelenterate medusa, as a jellyfish.

Origin of subumbrella

First recorded in 1875–80; sub- + umbrella
Related formssub·um·brel·lar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018