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Definitions of chem:
noun: A chemical weapon.
noun: A recreational drug.
noun: (uncountable, university slang, often capitalized) Clipping of chemistry (“branch of natural science”); usually referring to the subject or the department. [(uncountable) The branch of natural science that deals with the composition and constitution of substances and the changes that they undergo as a consequence of alterations in the constitution of their molecules.]
adjective: (informal) Clipping of chemical. [Of or relating to chemistry.]