A complex in which one component (the host) forms a cavity or, in the case of a crystal, a crystal lattice containing spaces in the shape of long tunnels or channels in which molecular entities of a second chemical species (the guest) are located., Keemiline ühend, mille molekuli üks osa („peremees“) moodustab õõnsuse, milles paikneb molekuli teine osa („külaline“)