(or-THO-uh-pee, OR-tho-ep-ee) 
noun
1. Study of the pronunciation of words.
2. Customary pronunciation of a language.
Etymology
Via Latin from Greek ortho- (correct) + epos (word), ultimately from the Indo-European root wekw- (to speak) that also gave us voice, vowel, vouch, vocation, evoke, revoke, advocate, and epic
Our resident orthoepist is Stuti Garg whose voice you hear in the pronunciation of the daily words.
Usage
"'Splash a little guzzelean,' the crowd muttered. 'Gas-o-lean,' shouted an angry Nikitia Ivanich from above. 'Is it really all that difficult to assimilate orthoepy?'" — Tatyana Tolstaya (translated by Jamey Gambrell); The Slynx; Houghton Mifflin; 2003.