(NH3) A colorless gas that is a compound of nitrogen and hydrogen, has a sharp smell and taste, and is used in cleaning products and in making fertilizers and explosives. Ammonia is naturally occurring and is an important component of the nitrogen cycle, but is also artificially produced through the Haber-Bosch process for industrial purposes.
Adapted from "ammonia." Merriam-Webster.com. Merriam-Webster, n.d. Web. 20 Nov. 2015.