desorbPronunciation: /diːˈsɔːb/Definition of desorb verb [with object] Chemistry cause the release of (an adsorbed substance) from a surface: these ‘active points’ desorb the resultant alkane [no object] (of an adsorbed substance) become released: the free radicals desorbed back into the chamberDerivatives desorbent adjective & noun desorber noun desorption noun Origin: 1920s: back-formation from desorption (from de- 'away' + adsorption)desorb in other Oxford dictionaries Definition of desorb in the US English dictionary