معنی کلمه :‌ perigeum

Shaped like a pitcher or urn; swelling below, and contrasted at the orifice, as a calyx or corolla.

That point in the orbit of the moon which is nearest to the earth; -- opposed to apogee. It is sometimes, but rarely, used of the nearest points of other orbits, as of a comet, a planet, etc. Called also epigee, epigeum.