nacre n. [F. nacre, mother-of-pearl] (MOLL) The pearly or iridescent substance that lines the interior of shells, especially gastropods and pelecypods; mother-of-pearl; nacreous a.

naiad n. [Gr. Naias, water nymph] (ARTHRO: Insecta) In Hemimetabola, the aquatic, gill-breathing nymph.

nail n. [A.S. naegel, nail] (ARTHRO) A tarsal claw; unguis.

naked a. [A.S. nacod, nude] Lacking the usual covering.

nanism n. [Gr. nanos, dwarf] Dwarfishness. nanoid a.

nanitic worker (ARTHRO: Insecta) In Formicidae, dwarf workers produced in first broods or later starved broods.

nanometer n. [Gr. nanos, dwarf; metron, a measure] Unit of measurement equal to one billionth of a meter; also called millimicron, micromillimeter and bicron.

nanoplankton n. [Gr. nanos, dwarf; plankton, wandering] Microscopic floating animal and plant organisms.

nanozooid n. [Gr. nanos, dwarf; zoon, animal; eidos, like] (BRYO: Stenolaemata) In Tubuliporidae, a polymorph with a single tentacle and reduced alimentary sac.

narcosis n. [Gr. narke, numbness, torpor] Stupor or unconsciousness caused by a drug or carbon dioxide build up in the blood.

nasale n. [L. nasus, nose] (ARTHRO: Insecta) Anterio-median projection from the frons formed by fusion of frons, clypeus and labrum, or by frons and clypeus alone, especially some Coleoptera larvae.

nascent a. [L. nascens, arising, beginning] Beginning to exist, grow, or develop; the act of being born.

naso n. [L. nasus, nose] (ARTHRO: Chelicerata) In Acari, an acronal protuberance at the anterior of the body overhanging the chelicerae.

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