||Nec`to*ca"lyx (?), n.; pl.
Nectocalyces (#). [NL., fr. Gr. ? swimming + ?
a calyx.] (Zoöl.) (a) The swimming
bell or umbrella of a jellyfish of medusa. (b)
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.