1. the innermost part of an organ or structure
Usage: anatomy
2. the medulla oblongata, the lower part of the brainstem that controls vital functions like breathing and heart rate
Usage: anatomy; medical
3. the soft inner tissue of plant stems or other plant parts
Usage: botany

Examples

• The kidney’s medulla contains the collecting ducts.
• Damage to the medulla can affect breathing and circulation.
• The adrenal medulla produces hormones like adrenaline.
• Scientists studied the medulla oblongata’s role in reflexes.
• The plant’s medulla was soft and spongy.
• Cross-sections showed the medulla at the stem’s center.