Definitions

1. noun

a semicircular or crescent-shaped moon phase

“The halfmoon illuminated the dark sky above the ocean.”

2. noun

the curved shape of a moon phase, especially one that is visible from the Earth

“The halfmoon was a beautiful sight to behold.”

3. noun

a crescent-shaped mark, typically on the face, formed by a bruise or a wound

“The boxer’s halfmoon was a deep purple color.”