or·thog·ra·phy /ɔrˈθɑgrəfi/
  正確拼字,拼字,正字法
  Or·thog·ra·phy n.
  1. The art or practice of writing words with the proper letters, according to standard usage; conventionally correct spelling; also, mode of spelling; as, his orthography is vicious.
     When spelling no longer follows the pronunciation, but is hardened into orthography.   --Earle.
  2. The part of grammar which treats of the letters, and of the art of spelling words correctly.
  3. A drawing in correct projection, especially an elevation or a vertical section.
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  orthography
       n : a method of representing the sounds of a language by written
           or printed symbols [syn: writing system]