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periodical cicada
Any of certain species of cicadas, especially in genus Magicicada, which are known for their 17- and 13-year life-cycles, during most of which they develop underground, emerging in large numbers for a short time as large and audible adults, all those emerging in a year constituting a brood.
e-periodicals
plural of e-periodical
e-periodical
A periodical published in electronic format to be read on a computer or similar device.
periodical comets
plural of periodical comet
periodic comets
plural of periodic comet
xerothermic periods
period pieces
plural of period piece
ovulatory periods
plural of ovulatory period
period drama
a work of the screen that evokes a particular historical period
periodic acid
(inorganic chemistry) HIO₄ or H₅IO₆, the oxyacids of iodine in which iodine has the highest oxidation number; H₅IO₆ is a white crystalline substance (HIO₄ is not stable), and both are strong oxidizing agents.