The Collaborative International Dictionary
Methylal
Methylal \Meth"yl*al\, n. [Methylene + alcohol.] (Chem.) A light, volatile liquid, H2C(OCH3)2, regarded as a complex ether, and having a pleasant ethereal odor. It is obtained by the partial oxidation of methyl alcohol. Called also formal.
Wiktionary
methylal
n. (context organic compound English) dimethoxymethane.