'astrometric' originates from Modern English, ultimately from Greek; specifically from the Greek elements 'astron' and 'metron', where 'astron' meant 'star' and 'metron' meant 'measure'.

'astrometric' developed from the noun 'astrometry' (New Latin/Modern English 'astrometria' / 'astrometry'), which itself was formed from Greek 'astron' + 'metron'; the adjective-forming suffix '-ic' was added in English to produce 'astrometric'.

Initially connected to the literal 'measurement of the stars', it evolved into the adjectival sense 'relating to astrometry' used in modern scientific contexts.