ˈhipnēə noun
Usage: capitalized
Etymology: New Latin, from Hypnum, genus of mosses
: 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