Definition of Hypnea
: a genus (the type of the family Hypneaceae) comprising red algae of the order Gigartinales that have a thallus of terete fleshy branches with the tips curving inward like tendrils and that include one (H. musciformis) which is occasionally used as a source of agar
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Origin and Etymology of hypnea
New Latin, from Hypnum, genus of mosses
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