How to pronounce d in English

"The fourth letter of the English alphabet and a vocal consonant. The English letter is from Latin which is from Greek which took it from Ph/nician the probable ultimate origin being Egyptian. It is related most nearly to t and th; as Eng. deep G. tief; Eng. daughter G. tochter Gr. qyga`thr Skr. duhitr. See Guide to Pronunciation �178 179

"The nominal of the second tone in the model major scale (that in C) or of the fourth tone in the relative minor scale of C (that in A minor) or of the key tone in the relative minor of F."

"As a numeral D stands for 500. in this use it is not the initial of any word or even strictly a letter but one half of the sign / (or / ) the original Tuscan numeral for 1000."