| The American Heritage® Book of English Usage. |
| A Practical and Authoritative Guide to Contemporary English. 1996. |
| 7. Pronunciation Challenges: Confusions and Controversy |
| § 62. diphthong |
As is the case with diphtheria, the ph should properly be pronounced (f), not (p). Because so many people say (d p-), as opposed to (df-), though, this variant has gradually become acceptable. | 1 |
| The American Heritage® Book of English Usage. Copyright © 1996 by Houghton Mifflin Company. All rights reserved. |
| CONTENTS · BIBLIOGRAPHIC RECORD · PRONUNCIATION SYMBOLS · WORD INDEX · SUBJECT INDEX | ||||
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