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perigeum
CIDE DICTIONARY
perigeum, n. [NL. perigeum, fr. Gr. about, near + the earth: cf. F. périgée.].
That point, in the orbit of the moon or other body orbiting the earth, which is nearest to the earth; -- opposed to apogee . It is sometimes, but rarely, used of the nearest points of bodies not orbiting the earth, such as of a comet, a planet, etc. Called also epigee , epigeum . [1913 Webster]
For further exploring for "perigeum" in Webster Dictionary Online
