Adventures By Design

adjective

1. shaped like a lentil, esp. by being biconvex : lenticular lenses.

Source:
“I watched as the nightside part of Earth—lenticular in this perspective, like a cat’s pupil abutting the blue crescent of the dayside—kissed the gray lunar horizon.”

Sawyer, Robert, J.Mindscan. New York: Tor, 2005: 89.