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perfunctory
perfuse
Pergamum
pergola
perhaps
peri
peri-
perianth
periapsis
periapt
periastron
pericarditis
pericardium
pericarp
perichondrium
periclase
periclinal
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periapsis
per·i·ap·sis [ pèrree ápsiss ] (plural per·i·ap·si·des [ pèrree ápsi dz ])


noun 
Definition:
 
astronomy nearest point in orbit: the point in an orbit that is nearest to the center of gravitational attraction
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