'atmometric' originates from Greek, specifically the elements 'atmos' and 'metron', where 'atmos' meant 'vapor' and 'metron' meant 'measure'.

'atmometric' developed from the noun 'atmometer' (a scientific instrument name coined in English in the 19th century) and the derived noun 'atmometry', eventually forming the adjective 'atmometric' to describe methods or properties related to those measurements.

Initially it referred to the instrument or the act of measuring vapor/evaporation; over time it evolved into an adjective describing methods, measurements, or properties related to the measurement of evaporation or atmospheric moisture.