'densitometric' originates from a combination of Latin and Greek roots: from Latin 'densus' meaning 'thick' (via 'density'/'densit-') and Greek 'metron' meaning 'measure', with the adjectival suffix '-ic' meaning 'pertaining to'.

'densitometric' developed from the noun 'densitometry' (the practice of measuring density), which itself was formed from 'density' (from Latin 'densitas', from 'densus') plus the Greek-derived combining form '-metry' (from 'metron' meaning 'measure'); the modern adjectival form then became 'densitometric'.

Initially the roots referred simply to 'thickness' and 'measure'; over time they combined to denote the technical process of measuring density and now mean 'relating to the measurement of density'.