'argentometrically' originates from New Latin/Modern scientific formation, specifically from the noun 'argentometry' (from Latin 'argentum' meaning 'silver' + Greek 'metron' meaning 'measure'), with the adjectival suffix '-ic' (forming 'argentometric') and the adverbial suffix '-ally'.

'argentometrically' changed from the modern English noun 'argentometry' (19th-century scientific coinage based on Latin 'argentum' and Greek 'metron') to the adjective 'argentometric' and eventually to the adverb 'argentometrically'.

Initially related to the idea of 'measurement of silver' (literal sense from 'argentum' + 'metron'), the term's usage narrowed to denote methods of quantitative chemical analysis that use silver reagents (e.g., silver nitrate titration); the adverbial form denotes performing an analysis by that method.