n.
Pronunciation: ˌ käz-m ō - ' ke-m ə -str ē
Function: noun
Etymology: Greek kosmos universe
Date: 1940
: a branch of chemistry that deals with the chemical composition of and changes in the universe
– cos · mo · chem · i · cal \ - ' ke-mi-k ə l \ adjective
– cos · mo · chem · ist \ -mist \ noun