The middle bone of the proximal series of the carpus in the wrist, which is shaped like a half-moon.
"The lunar is the middle bone of the proximal series of the carpus in the wrist, which is shaped like a half-moon."
"The lunar was visible in the night sky above our heads."
Of, pertaining to, or resembling the Moon (that is, Luna, the Earth's moon); Lunar.
"The lunar surface is covered in craters formed by ancient meteorite impacts."
Pertaining to Luna, the moon of Terra.
In plain English: Lunar means something related to the moon, such as its light or phases.
"The lunar calendar is used to track the phases of the moon."
Usage: Use "lunar" as an adjective specifically when referring to things related to the Moon itself, such as lunar eclipses or lunar calendars. Do not use it for general nighttime events unless they are directly caused by the Moon's presence in the sky.
The word lunar comes from the Latin term lūnāris, which originally meant "of or pertaining to the moon." This Latin root traces back to a Proto-Indo-European word for "bright" or "to shine."