1. n. [Drilling Fluids]

Ethylenediamine tetraacetic acid, the reagent used to titrate for calcium and magnesium ions (hardness ions) in water samples. It is also known as versenate or titraver.

Synonyms: versenate

See: calcium sulfate,  calcium test,  hardness ion,  magnesium test,  sequestering agent,  soft water,  titration,  total hardness test