An organic or inorganic ion or molecule that occupies a cavity, cleft or pocket within the molecular structure of a
host molecular entity and forms a
complex with it or that is trapped in a cavity within the crystal structure of a host.
Source: PAC, 1994,
66, 1077. (
Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1118 [
Terms] [
Paper]