American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
And the successive vowels should not be treated as a diphthong, though some small degree of slurring between them is inevitable.— Ask MetaFilter
«A syllable is long a. If it contains a long vowel or a diphthong, as «cū´-r poe´-nae», «aes-tā´-te b. If it ends in a consonant which is followed by another consonant, as «cor´-pus», «mag´-nus NOTE.— Latin for Beginners
It takes about as long to pronounce a short vowel plus a consonant as it does to pronounce a long vowel or a diphthong, and so these quantities are considered equally long.— Latin for Beginners
_ If it contains a long vowel or a diphthong, as «cū´-rō»,— Latin for Beginners
Two vowels together must never be sounded as a diphthong, and a long vowel counts for two syllables, likewise a final "n", and the consonant "m" in some cases.— Japanese Prints
Diphthong has been looked up 2492 times, favorited once, listed 54 times, and commented on 9 times.

American Heritage Dictionary (1)
Century Dictionary (1)
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