The word 'unionized' presents a fascinating case of identical spelling for two distinct etymological paths. For the labor sense, the journey begins with the Latin noun 'unio', meaning "oneness" or "a single pearl," derived from 'unus' (one). Combined with the Greek-derived verbal suffix '-ize' (to make) and the adjectival '-ed', it literally means "made into a union," specifically a trade union. For the chemistry sense, the core is 'ion', a term coined by Michael Faraday from Greek 'ion' (going, neuter present participle of 'ienai' to go), to describe particles that "go" to electrodes. Adding the negating prefix 'un-' and the same '-ized' suffix creates the sense "not made into ions." The identical modern spelling is a coincidence of English orthography, where the morpheme boundary differs ('un-ionized' vs. 'union-ized').

Structure: union (the act of uniting) + ize (to make) + ed (adjective suffix) union: From Latin 'unio' (oneness, unity), via Old French. Functions as the core noun root. ize: A verb-forming suffix of Greek origin (via Latin -izare), meaning "to render, make, or become". ed: A suffix of Old English origin, here forming a participial adjective meaning "having been made".