The pronunciation of two adjacent vowels as separate sounds rather than as a dipthong, as in coordinate; also, the mark indicating the separate pronunciation, as in naïve.
Dibrach - See Pyrrhic Diction - The choice of words, phrases, sentence structures, and figurative language in a literary work; the manner or mode of verbal expression, particularly with regard to clarity and accuracy.
Didactic Poetry - Poetry which is clearly intended for the purpose of instruction -- to impart theoretical, moral, or practical knowledge, or to explain the principles of some art or science.