Semicircular (adjective)

Having the form of half a circle.

Origin:

Early 17th century: from semi- + circular.

Examples:

1. The semicircular arch of the ancient Roman aqueduct still stands.
2. The semicircular balcony provides a panoramic view of the city.
3. The semicircular design of the amphitheater allowed for excellent acoustics.
4. The semicircular bay of the coastline is dotted with rocky cliffs and sandy beaches.
5. The semicircular shape of the moon during a partial lunar eclipse is caused by the Earth blocking part of the Sun's light.