orthoepic

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or·tho·e·py

O0129600 (ôr-thō′ə-pē, ôr′thō-ĕp′ē)n.1. a. The study of the pronunciation of words.b. The study of the relationship between the pronunciation of words and their orthography.2. The customary pronunciation of words.
[Greek orthoepeia, correctness of diction : ortho-, ortho- + epos, epe-, word; see wekw- in Indo-European roots.]
or′tho·ep′ic (-ĕp′ĭk), or′tho·ep′i·cal (-ĕp′ĭ-kəl) adj.