the.com/iodide

means A compound containing iodine bonded to another element, most familiarly the potassium iodide added to table salt to prevent iodine-deficiency disorders.

from Iodine itself was named first, from Greek 'iodes' meaning 'violet-colored,' because the element gives off a striking purple vapor when heated. 'Iodide' is simply the standard chemical suffix '-ide' tacked on to mark it as a compound where iodine has bonded with another element — the same pattern as chloride or oxide. So the word is really just chemistry's filing system, built on a Greek observation about a cloud of violet smoke.