‖Nec′to‐ca″lyx (?), n.; pl.Nectocalyces (#). [NL., fr. Gr. νηκτόσ 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.