methylene
noun(meth-y-lene)
a divalent hydrocarbon group CH2 derived from methane
methylene
noun(meth-y-lene)
a basic thiazine dye C16H18ClN3S·3H2O used especially as a biological stain, an antidote in cyanide poisoning, and an oxidation-reduction indicator
methylene
noun(meth-y-lene)
a toxic nonflammable liquid CH2Cl2 used especially as a solvent, paint remover, and aerosol propellant