1. n. [Drilling Fluids]

During a titration procedure in analytical chemistry, the point at which reagent addition should be immediately stopped and the volume of reagent recorded. The endpoint represents the end of a specific chemical reaction, such as precipitation, and may be indicated by a color change, a voltage or pH reading or an inflection point on a graphical plot of the data.

See related terms: alkalinity test,  calcium test,  chloride test,  chromate salt,  indicator,  meniscus,  methylene blue test,  phenolphthalein,  titration,  total hardness test