• Webster's Revised Unabridged Dictionary
    • n Hydromedusa (Zoöl) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusæ.☞ Such medusæ are the reproductive zooids or gonophores, either male or female, of the hydroid from which they arise, whether they become free or remain attached to the hydroid colony. They in turn produce the eggs from which the hydroids are developed. The name is also applied to other similar medusæ which are not known to bud from a hydroid colony, and even to some which are known to develop directly from the eggs, but which in structure agree essentially with those produced from hydroids. See Hydroidea, and Gymnoblastea.
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Century Dictionary and Cyclopedia
    • n hydromedusa Same as hydromedusan.
    • n hydromedusa [capitalized] A genus of reptiles.
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Webster's Revised Unabridged Dictionary
NL. See Hydra, and Medusa


In literature:

In the above-given classification, the Scyphomedusae, formerly included with the Hydromedusae as Hydrozoa, are placed nearer the Anthozoa.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6" by Various
Hydromedusae, a group of invertebrate animals, the typical members of which are branched colonies of polyps: Weismann's investigations on, viii, xii.
"The Biological Problem of To-day" by Oscar Hertwig
The Hydromedusae represent, therefore, a sub-class of the Hydrozoa.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various