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

per·i·anth [ pérree ànth ] (plural per·i·anths)


noun 
Definition:
 
flower part: the outer structure of a flower, made up of the corolla, the calyx, or both

[Early 19th century. Via French< modern Latin perianthium< Greek peri "around" + anthos "flower"]
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