- CH2SO3H2
- Methionic Meth`i*on"ic, a. [Methyl + thionic.] (Chem.) Of, pertaining to, or designating, a sulphonic (thionic) acid derivative of methane, obtained as a stable white crystalline substance, {CH2.(SO3H)2}, which forms well defined salts. [1913 Webster]
The Collaborative International Dictionary of English. 2000.