An event of a woman's discharging of menstrual flow of blood and cells.

(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.

(rhetoric) A sentence whose main clause appears at its end.

rotational period

(of an astronomic object) The time taken to rotate about its axis relative to the background stars.

plural of periodic table

Alternative form of periodic comet

(astronomy) A comet which orbits the Sun and which returns to the innermost point of its orbit at known, regular intervals.

(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.

(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).