English word ionize comes from English -ize, English ion

Detailed word origin of ionize

Dictionary entry	Language	Definition
-ize	English (eng)	Used to form verbs from nouns or adjectives, the verbs having the sense of "to make what is denoted by the noun/adjective".
ion	English (eng)	An atom or group of atoms bearing an electrical charge, such as the sodium and chlorine atoms in a salt solution.
ionize	English (eng)	(chemistry, physics) To dissociate atoms or molecules into electrically charged species; to be thus dissociated.

Words with the same origin as ionize