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The Collaborative International Dictionary
Nectocalyces

Nectocalyx \Nec`to*ca"lyx\, n.; pl. Nectocalyces. [NL., fr. Gr. nhkto`s swimming + ? a calyx.] (Zo["o]l.)

  1. The swimming bell or umbrella of a jellyfish of medusa.

  2. 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)