plural of periodic inequality

(astronomy) A disturbance in the motion of a planet due to its position in its orbit relative to another planet.

plural of periodic month

Synonym of tropical month

plural of periodic structure

(grammar) A sentence whose main clause appears at the end, after other, especially dependent, clauses. / (physics) A structure made of bays coupled through one or more coordinates.

plural of periodic function

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.

plural of periodical comet

plural of periodic comet