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periods

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periods,

n.pl horizontal rows of elements within a periodic table. Elements within a period share similar physical and chemical properties.

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Periodontitis
periodontium
periodontoclasia
periodontology
periodontometer
periodontopathic
periodontosis

periods
periomphalic
perionychia
perionychitis
perionychium
perioophoritis
perioophorosalpingitis
perioperative

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