| The American Heritage® Book of English Usage. |
A Practical and Authoritative Guide to Contemporary English. 1996.
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7. Pronunciation Challenges: Confusions and Controversy
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| § 61. diphtheria |
This word is properly pronounced (d f-thîr´ - ), with the ph pronounced (f). Many people, however, say (dp-thî´-), including medical professionals, and most dictionaries (of American English anyway) have included this variant pronunciation for the last thirty or forty years. | 1 |
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| The American Heritage® Book of English Usage. Copyright © 1996 by Houghton Mifflin Company. All rights reserved. |
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