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 (hī′drō-mĭ-do͞o′sə, -dyo͞o′-)
n. pl. hy·dro·me·du·sas or hy·dro·me·du·sae (-sē)
A hydrozoan in the medusoid stage of its life cycle.


n, pl -sas or -sae (-siː)
(Animals) the medusa form of hydrozoan coelenterates
ˌhydromeˈdusan adj


(ˌhaɪ droʊ mɪˈdu sə, -zə, -ˈdyu-)

n., pl. -sae (-sē).
the medusa form of a hydrozoan.
[1885–90; < New Latin; see hydra, -o-, medusa]
hy`dro•me•du′san, adj.
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References in periodicals archive ?
1962) Extraction, purification and properties of aequorin, a bioluminescent protein from the luminous hydromedusan, Aequorea.
infrastructure and cytochem-istry of glycogen-containing vacuoles in gastrodermal cells in developing hydranths of a hydromedusan coelenterate.
However, exumbrellar radial muscles in the hydromedusan velum contract locally to create asymmetric contractions (Gladfelter, 1972, 1973).