subumbrella

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sub·um·brel·la

 (sŭb′ŭm-brĕl′ə)
n.
The concave underside of the medusa of a jellyfish or other cnidarian.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

subumbrella

(ˌsʌbʌmˈbrɛlə)
n
the muscular and concave underside of the umbrella of a jellyfish
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

sub•um•brel•la

(ˌsʌb ʌmˈbrɛl ə)

n., pl. -las.
the concave undersurface of a jellyfish.
[1875–80]
sub`um•brel′lar, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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