ˌnirēōˈsistə̇s noun
Usage: capitalized
Etymology: New Latin, from nereo- (from Greek Nēreus Nereus) + -cystis
: a monotypic genus of probably annual brown algae (family Laminariaceae) of the northern Pacific that have a stripe which sometimes exceeds 100 feet in length, is hollow in its upper part, and terminates in a large spherical float supporting dependent long thin dichotomously branched laminae and that have been used as a source of potash — see sea-otter's-cabbage