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Definition of Formaldehyde

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).

Formalin is a 37% aqueous (water) solution of formaldehyde.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=13315
Last Editorial Review: 6/14/2012

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