othoepy

from The Century Dictionary.

• noun The art of uttering words with propriety; a correct pronunciation of words.
• noun That part of grammar (often included under orthography) which treats of pronunciation. More recently phonology.

from the GNU version of the Collaborative International Dictionary of English.

• noun The art of uttering words correctly; a correct pronunciation of words; also, mode of pronunciation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a term formerly used for the part of phonology that dealt with the `correct' pronunciation of words and its relation to `correct' orthography
• noun the way a word or a language is customarily spoken