'antimonialize' originates from Modern English, specifically the word 'antimonial' + the verb-forming suffix '-ize' (to make or render). 'Antimonial' itself comes from 'antimony' + '-al'.

'antimonial' (Modern English) ultimately derives from Medieval Latin 'antimonium' (or Late Latin), via Old French 'antimoine' (or similar forms); 'antimonium' was used for the element 'antimony', and the English verb-forming process produced 'antimonialize'.

Initially it meant 'to render into or treat with an antimonial compound' or 'to administer antimony' (frequently in a medical/emetic sense); the core meaning has remained similar, but the term is now rare or archaic.