Castelnuovo Nigra, a comune (municipality) in the Province of Turin in the Italian region Piedmont
Porta Nigra, a large Roman city gate in Trier, Germany
Rupes Nigra, a phantom island, was believed to be a 33-mile-wide magnetic island of black rock located at the Magnetic North Pole
Medicine
Dermatosis papulosa nigra, a condition of many small, benign skin lesions on that face that closely simulate seborrheic keratoses, a condition generally presenting on dark-skinned individuals
Linea nigra, a dark vertical line that appears on the abdomen during pregnancy
Substantia nigra, a portion of the brain associated with dopamine production
Tinea nigra, a superficial fungal infection that causes dark brown to black painless patches on the soles of the hands and feet
People
Christina Nigra, an actress who performed in The Sword and the Sorcerer, Twilight Zone: The Movie, and Cloak & Dagger
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