am·mine \ˈaˌmēn, ˈamə̇n; əˈmēn, aˈ-\noun (-s) Etymology: International Scientific Vocabulary ammonia + -ine 1.: a molecule of ammonia as it exists in a coordination complex < hex-ammine-cobalt chloride [Co(NH3)6]Cl3 > 2.: any compound with ammonia or sometimes with an amine regarded as a coordination complex < metal ammines > — compare ammoniate