Synonym of tropical month

plural of periodic acid

(accounting) A system of assessing a business' inventory in which updates are made on a periodic basis, so that a completely accurate account is only available immediately after the update.

Alternative form of periodic comet

Alternative spelling of quasiperiodic

(chemistry) A tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).

(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.

(mathematics) Any function whose value repeats after the regular addition of a period to its independent variable; i.e., a function ƒ such that, for some positive constant p, ƒ(x + p) = ƒ(x) for all x.

(astronomy) Taking over 200 years to complete an orbit; especially said of comets.

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.