1
: a binary compound of methyl usually with a metal
mercuric methide Hg(CH3)2
2
: a compound that contains a methylene group as part of a quinonoid structure and that is formed as an intermediate in the condensation of a phenol and formaldehyde to yield a resin
quinone methide O=C6H4=CH2
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Merriam-Webster unabridged
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