Adjective
Of or pertaining to orthography, or right spelling; also, correct in spelling; as, orthographical rules; the letter was orthographic.
Of or pertaining to right lines or angles.
Source: Webster's dictionaryJan Hus While Old Czech had a basic alphabet from which a general set of orthographical correspondences was drawn, it did not have a standard orthography. Source: Internet
Tacitus uses Claudius' arguments for the orthographical innovations mentioned above and may have used him for some of the more antiquarian passages in his annals. Source: Internet