scyphozoan
noun
scy·pho·zo·an ˌsī-fə-ˈzō-ən 
: any of a class (Scyphozoa) of cnidarians (such as the sea nettle) that possess a large, conspicuous, sexually-reproducing medusa typically lacking a velum and a very small, usually funnel-shaped, asexually-reproducing polyp
scyphozoan adjective
Word History
Etymology
New Latin Scyphozoa, from Latin scyphus + New Latin -zoa
First Known Use
circa 1909, in the meaning defined above