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perikaryon
peril
peril point
perilla
perilous
perilune
perilymph
perimeter
perimorph
perimysium
perinatal
perinatology
perinephrium
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periodic system
pe·ri·od·ic sys·tem


noun 
Definition:
 
system of organizing chemical elements: the system of arranging chemical elements in a table according to the periodic law
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