harman

1. (obsolete, thieves' cant) A policeman.Examples: "I Frisky Moll, with my rum coll, / Wou'd Grub in a bowzing ken; / But ere for the scran he had tipt the cole, / The Harman he came in."; "I pray you now send me some dub, / A bottle or two to the needy. / I beg you won't bring it yourself, / The harman is at the Old-Bailey; / I'd rather you'd send it behalf, / For, if they twig you they'll nail you."obsolete

2. (organic chemistry) An indole alkaloid, 1-methyl-9H-β-carboline (C12H10N2) found in several foods, plants and beverages which is carcinogen. It is a specific, reversible inhibitor of monoamine oxidase A.Examples: "Harman is a common compound in several foods, plants and beverages. Numerous studies have demonstrated its mutagenic, co-mutagenic and carcinogenic effects; however, the exact mechanism has not been fully identified."