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nacelle an enclosure on an aircraft for housing the engine, the cargo, or the crew and passengers. [2 definitions]
nacho a small tortilla chip spread with cheese and sometimes other spicy food and then broiled.
nacre a hard, iridescent material lining certain seashells, such as that of the pearl oyster; mother-of-pearl.
nacreous of, pertaining to, or characteristic of nacre. [2 definitions]
nadir the lowest or most depressing point or stage. [2 definitions]
nag1 to bother with constant complaints, demands, or instructions; pester. [6 definitions]
nag2 a horse that has little value or has outlived its usefulness.
nagana a disease of livestock transmitted by the bite of infected tsetse flies.
nah (informal) no.
Nahuatl a member of a group of Indian peoples of Mexico and Central America that includes the Aztecs. [2 definitions]
Nahum according to the Old Testament, a minor prophet of Israel of the seventh century B.C. [2 definitions]
naiad (sometimes cap.) a water nymph of Greek mythology, presiding over rivers, springs, and fountains. [2 definitions]
naif one who is inexperienced or naive; innocent.
nail a slim, pointed metal rod, usu. topped by a flat head, that can be hammered into a material such as wood in order to fasten or reinforce. [7 definitions]
nail down to specify or settle.
nail file a small flat pointed file for cleaning, shaping, and smoothing the fingernails.
nailhead the enlarged surface of one end of a nail, usu. flat but sometimes rounded. [2 definitions]
nail polish a clear or colored lacquer applied to fingernails and toenails.
nail set a short metal rod used to drive a nailhead level with or below a wood surface.
nail varnish (chiefly British) a clear or colored lacquer applied to fingernails and toenails; nail polish.
nainsook a thin, soft cotton fabric, used for underclothes and infant clothing.