The Collaborative International Dictionary
Heterographic
Heterographic \Het`er*o*graph"ic\, a. [See Heterography.] Employing the same letters to represent different sounds in different words or syllables; -- said of methods of spelling; as, the ordinary English orthography is heterographic.
Wiktionary
heterographic
a. 1 misspelled; of or pertaining to an incorrect spelling or a spelling that differs from accepted standards. 2 (context linguistics English) Of a writing system in which a particular symbol represents more than one possible sound.