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From: Webster's Revised Unabridged Dictionary (1913)

 Nec·to·ca·lyx n.; pl. Nectocalyces   Zool. (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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