genus Pereskia
— Noun
– English
～ genus of tropical American shrubby trees and woody climbers having slender branches with broad flat leaves and large panicles of flowers
genus Peridinium
— Noun
– English
～ type genus of the family Peridiniidae
genus Perilla
— Noun
– English
～ small genus of Asiatic herbs
gestation period
— Noun
– English
～ the period during which an embryo develops (about 266 days in humans)
grace period
— Noun
– English
～ a period of time past the deadline for fulfilling an obligation during which a penalty that would be imposed for being late is waived, especially an extended period granted as a special favor; "The payment had originally been due on April 1 but we had a grace period which expired in June."
glacial period
— Noun
– English
～ any period of time during which glaciers covered a large part of the earth's surface; "the most recent ice age was during the Pleistocene"
geological period
— Noun
– English
～ a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"