1. Plural of medulla; the innermost part or core of an organ or structure, especially the medulla oblongata of the brain or the medulla of the adrenal gland.
Usage: anatomy; medical
2. In botany, the spongy tissue in the center of plant stems.
Usage: botany

Examples

• The medullas of the brain control vital functions like breathing and heart rate.
• Damage to the medullas oblongatas can be life-threatening.
• The adrenal medullas produce hormones such as adrenaline.
• Plant medullas are composed of parenchyma cells.
• Scientists studied the medullas to understand neural regulation.