(offensive, ethnic slur) A black person.

(Southern US) Alternative form of Negro

plural of Nigra

plural of nigra

(anatomy) A brain structure located in the mesencephalon (midbrain) that plays an important role in reward, addiction, and movement, damage to which occurs in Parkinson's and Parkinsonian patients.

plural of substantia nigra

A dark vertical line, running up the abdomen from the pubis to the navel (though it sometimes runs further, to the top of the abdomen) that forms during pregnancy.

plural of substantia nigra

(organic chemistry) A complex, nitrogenous, organic base and black dyestuff

Of or pertaining to the substantia nigra