[Nat]

Main Entry: or·thog·ra·phy
Pronunciation: \ȯr-ˈthä-grə-fē\
Function: noun
Etymology: Middle English ortografie, from Anglo-French, from Latin orthographia, from Greek, from orth- + graphein to write — more at carve
Date: 15th century
1 a : the art of writing words with the proper letters according to standard usage b : the representation of the sounds of a language by written or printed symbols
2 : a part of language study that deals with letters and spelling

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This word always makes me think of Kenneth Branaugh in Much Ado About Nothing when he's complaining about his friend Claudio falling in love:

"He was wont to speak plain and to the purpose (like an honest man and a soldier), and now is he turn'd orthography -- his words are a very fantastical banquet, just so many strange dishes" (II.iii.18-21).