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nematic
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nekton

nek·ton [ néktən, nék tòn ]


noun 
Definition:
 
swimming organism: an organism such as a fish that lives in water and can actively swim against currents, as opposed to microorganisms that are simply carried along

[Late 19th century. < Greek nēkton, form of nēktos "swimming" < nēkhein "to swim"]

nek·ton·ic [ nek tónnik ] adjective
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