The Collaborative International Dictionary
Nectocalyces
Nectocalyx \Nec`to*ca"lyx\, n.; pl. Nectocalyces. [NL., fr. Gr. nhkto`s swimming + ? a calyx.] (Zo["o]l.)
The swimming bell or umbrella of a jellyfish of medusa.
One of the zooids of certain Siphonophora, having somewhat the form, and the essential structure, of the bell of a jellyfish, and acting as a swimming organ.
Wiktionary
nectocalyces
n. (plural of nectocalyx English)