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periclinal
pericline
pericope
pericranium
pericycle
periderm
peridium
peridot
peridotite
perigee
Périgueux
perigynous
perihelion
perikaryon
peril
peril point
perilla
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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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