In jellyfish and other marine organisms, the outer surface of the bell-shaped body; the convex surface opposite the mouth.
From Latin ex- (outside) combined with umbrella (the dome-shaped part). This marine biology term specifically names the outer curved surface of a jellyfish's bell.
Jellyfish biologists coined 'exumbrella' and 'subumbrella' to distinguish the outer dome from the inner cavity — it's a perfect example of how scientific Latin terms let researchers describe anatomy with precision that English couldn't match.
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