plural of periodogram

(organic chemistry) Any heterocycle containing hypervalent iodine.

plural of periodinane

(dentistry) Inflammation of soft tissues around one's teeth such as the gums.

Resembling a period (time of menstruation).

Obsolete form of periodic.

plural of periodide

(inorganic chemistry) An iodide containing a higher proportion of iodine than any other iodide of the same substance or series

periodicity

One who publishes, or writes for, a periodical.