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perineum
perineurium
period
period certain
period piece
periodic
periodic acid
periodic function
periodic law
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periodical cicada
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perilune
per·i·lune [ pérrə ln ] (plural per·i·lunes)


noun 
Definition:
 
lunar orbit point closest to Moon: the point at which a planet or other body orbiting the Moon comes closest to the Moon's surface
[Mid-20th century. <peri- + Latin luna "moon"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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