Definition of substantia nigra
plural substantiae nigrae
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\səb-ˌstan(t)-chē-ˌē-ˈnī-(ˌ)grē, -ˈni-\
: a layer of deeply pigmented gray matter situated in the midbrain and containing the cell bodies of a tract of dopamine-producing nerve cells whose secretion tends to be deficient in Parkinson's disease
