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perionychium
periosteum
periostitis
periostracum
periotic
Peripatetic
peripatetic
peripatus
peripheral
peripheral nerve entrapment syndrome
peripheral nervous system
periphery
periphery region
periphrasis
periphrastic
periphyton
periplasm
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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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