Nectozooid see nectophore

Needham's sac/organ (MOLL: Cephalopoda) In males, a specialization of the sperm duct for formation and storage of spermatophores; spermatophoric sac.

negative geotropism Movement directed away from the earth's gravitational force.

negative phototropism The tendency to retreat from light.

negative tropism The tendency to retreat from stimuli.

nekton n. [Gr. nektes, swimmer] Organisms that swim in the open water, i.e., jellyfish, squid, fishes, turtles, seals and whales; necton. see seston.

nema n. [Gr. nema, thread] (NEMATA) Any individual of the phylum Nemata; a nematode.

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