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countable and uncountable, plural formaldehydes
(organic chemistry) The simplest aldehyde, HCHO, a colourless gas that has many industrial applications; it dissolves in water to give formol (10%) and formalin. quotations examples
The shark chosen to replace the original was injected with 224 gallons of formaldehyde, ten times the amount used on the first shark and in a stronger concentration.
2010, Don Thompson, The $12 Million Stuffed Shark, Aurum Press Limited