formaldehyde, methanal
(noun) a colorless poisonous gas; made by the oxidation of methanol
Source: WordNet® 3.1
formaldehyde (countable and uncountable, plural formaldehydes)
(organic compound) The simplest aldehyde, H-CHO, a colourless gas that has many industrial applications; it dissolves in water to give formol (10%) and formalin.
• (H-CHO): E240 (when used as a preservative), methanal (IUPAC name)
• (organic compound): aldehyde
Source: Wiktionary
For*mal"de*hyde, n. Etym: [Formic + aldehyde.] (Chem.)
Definition: A colorless, volatile liquid, H2CO, resembling acetic or ethyl aldehyde, and chemically intermediate between methyl alcohol and formic acid.
Source: Webster’s Unabridged Dictionary 1913 Edition
27 April 2025
(adjective) not quite exact or correct; “the approximate time was 10 o’clock”; “a rough guess”; “a ballpark estimate”
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