D defs.my
Entry 1 sense Webster, 1913

Methionic

· Meth·i·on·ic · IPA
01 a. Of, pertaining to, or designating, a sulphonic (thionic) acid derivative of methane, obtained as a stable white crystalline substance, CH2.…
  1. 1.
    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.(Chem.)