n, pl  n's  or  ns   1  :  the haploid or gametic number of chromosomes - compare X   2  cap  :  an antigen of human blood that shares a common genetic locus with the M antigen .
abbr 1  nasal  2  newton  3  usu ital  normal (sense 4a) - used of solutions <0.1 N hydrochloric acid> 
symbol 1  nitrogen - usu. italicized when used as a prefix <N-allylnormorphine>   2  index of refraction .
or  ns  pl of  N.
 
 
 
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