1. 
   perigeum
   <astronomy> 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. ... Synonym: epigee, epigeum. ... Origin: NL. Perigeum, fr. Gr. About, near + the earth: cf. ...
   Found op http://www.mondofacto.com/facts/dictionary?perigeum
   
   
2. 
   Perigeum
   • (n.) 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.
   Found op http://thinkexist.com/dictionary/meaning/perigeum/
   
   

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