Definitions

1. proper noun

A German surname, or a place name in Germany.

“The Ostwald family has lived in Germany for generations.”

2. noun

A chemical reaction in which an element or compound is oxidized, typically resulting in a change of color or a release of heat.

“The Ostwald process is used to produce nitric acid.”

3. noun

A unit of measurement, especially in chemistry, used to express the amount of a substance.

“The Ostwald unit is a measure of the amount of a substance in a reaction.”