Definition of inverse spelling in English:

inverse spelling

noun

  • An unetymological spelling based on the spelling of a similar sounding word or phoneme, especially one in which an unetymological element is inserted in a word on the basis of analogy with another word where the element in question is etymologically justified, but is no longer pronounced, e.g. the spelling of limb (Old English lim) with a b, by analogy with lamb (Old English lamb).

Origin

Early 20th century.