Definition of "substantia" []

• Substance: used chiefly in a few anatomical phrases. (noun)

The Century Dictionary (Public Domain)

• "Slow pain is transmitted via slower type C fibres to laminae II and III of the dorsal horns, together known as the substantia gelatinosa."
• "Studies show that the part of the brain affected most by Parkinson's (called the substantia nigra) has a high level of receptors for vitamin D."
• "Studies show that the part of the brain affected most by Parkinson's called the substantia nigra has a high level of receptors for vitamin D."