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NYSE abbreviation of "New York Stock Exchange."
nystagmus an involuntary twitching or vibrating movement of the eyeball, usu. from side to side.
nystatin a yellowish antibiotic powder used to cure certain fungal infections, esp. of the skin and mucous membranes.
O1 in poetry, prayer, or solemn address, used before the name of the person or thing being spoken to. [2 definitions]
O2 symbol of the chemical element oxygen.
o the fifteenth letter of the English alphabet. [4 definitions]
o- away; against.
oaf a stupid, rudely unpleasant, or bumbling person; blockhead.
oak a tree that belongs to the beech family and bears acorns. [2 definitions]
oak apple a harmless, applelike gall produced on oak trees by the larvae of a type of wasp.
oak-leaf cluster a small bronze or silver cluster of oak leaves and acorns worn on the ribbon of a medal to signify multiple awardings of the same medal.
oaktag sturdy cardboard used for posters, folders, and the like; tagboard.
oakum loose rope fiber, often treated with tar, used to caulk seams in wooden ships.
oar a long pole, broad and flat at one end, that is used to row, or sometimes steer, a boat. [4 definitions]
oarfish any of several large slender ocean fish, ranging in length from about twelve to almost thirty feet, that have a dorsal fin along the entire length of the back and a red-tipped, manelike crest at the back of the head.
oarlock on a boat, a U-shaped or ringlike device that acts as a holder and pivot for an oar.
oarsman someone who rows a boat.
OAS abbreviation of "Organization of American States."
oasis an area of vegetation in the midst of a desert, fed by a spring or well. [2 definitions]
oast a kiln used for drying and curing tobacco or for drying hops or malt.
oat (usu. pl.; used with a sing. or pl. verb) a grain plant widely raised in cool climates, or any of several similar plants. [2 definitions]