plural of Nigra

plural of nigra

(Southern US) Alternative form of Negro

(offensive, ethnic slur) A black person.

plural of substantia nigra

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.

(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.

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

Of or pertaining to the substantia nigra