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period piecePeriodate
Periodic
periodic acid
periodic apnea of the newborn
periodic breathing
Periodic comet
periodic event
Periodic function
periodic group
periodic law
periodic motion
periodic movement
periodic sentence
periodic table
Periodical
-- periodical cicada --
Periodical year
Periodicalist
Periodically
Periodicalness
Periodicity
Periodide
Periodontal
periodontal disease
periodontia
periodontic
periodontics
periodontist
periodontitis
Periodoscope
Perioeci
Periophthalmus
periodical cicada
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| Noun | 1. |  periodical cicada - North American cicada; appears in great numbers at infrequent intervals because the nymphs take 13 to 17 years to matureSynonyms: Magicicada septendecim, seventeen-year locust |