Etymology
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Freon (n.)

1932, proprietary name in U.S. for fluorocarbons used in refrigeration technology. "The name was apparently constructed from fre(eze) + -on used as an arbitrary suffix" [Flood].

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Definitions of Freon

Freon (n.)
any one or more chlorofluorocarbons (or related compounds) that are used as an aerosol propellant, organic solvent, or refrigerant;
From wordnet.princeton.edu