Medical Definition of Formalin
Formalin: A 37% aqueous (water) solution of formaldehyde, a pungent gas, with the chemical formula HCHO, used as an antiseptic, disinfectant, and especially today as a fixative for histology (the study of tissues under the microscope).Source: MedTerms™ Medical Dictionary
Last Editorial Review: 5/13/2016
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