1. shaped like a half-moon or crescent
2. relating to or resembling a half-moon
Usage: anatomy; medical

Examples

• The semilunar valves in the heart prevent blood from flowing backward.
• Ancient architects often incorporated semilunar windows into their designs.
• The semilunar cartilages in the knee help cushion the joint.
• She noticed the semilunar shape of the moon in the early evening sky.
• The doctor examined the semilunar fold of the patient’s eyelid.
• Semilunar arches decorated the entrance to the medieval cathedral.