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periastron
pericarditis
pericardium
pericarp
perichondrium
periclase
periclinal
pericline
pericope
pericranium
pericycle
periderm
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Périgueux
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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"]
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