adj.1 of, relating to, or determined by the moon.
2 concerned with travel to the moon and related research.
3 (of light, glory, etc.) pale, feeble.
4 crescent-shaped, lunate.
5 of or containing silver (from alchemists' use of luna ( moon) for 'silver').
Phrases and idioms:
lunar caustic silver nitrate, esp. in stick form. lunar cycle METONIC CYCLE. lunar distance the angular distance of the moon from the sun, a planet, or a star, used in finding longitude at sea. lunar module a small craft used for travelling between the moon's surface and a spacecraft in orbit around the moon. lunar month
1. the period of the moon's revolution, esp. the interval between new moons of about 291/2 days.
2 (in general use) a period of four weeks. lunar nodes the points at which the moon's orbit cuts the ecliptic. lunar observation the finding of longitude by lunar distance.
lunar orbit
1. the orbit of the moon round the earth.
2 an orbit round the moon. lunar year a period of 12 lunar months.
Etymology: L lunaris f. luna moon