(a.) 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.
Example Sentences:
(1) Tissue valves available in the United States are the Carpentier-Edwards and Hancock porcine heterograph valves.
Heterography
Definition:
(n.) That method of spelling in which the same letters represent different sounds in different words, as in the ordinary English orthography; e. g., g in get and in ginger.