| Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993. |
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| diphtheria, diphthong, naphtha, ophthalmology (nn.) |
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| The Standard pronunciations of these four words are usually dif-THIR-ee-uh, DIF-thawng, ahf-thal-MAHL-uh-jee, and NAF-thuh. But many speakers of Standard English begin these words with the sounds dip-, dip-, ahp-, and nap-, respectively, and these speakers include physicians, phoneticians, eye doctors, and chemists. Widespread it may be, but some conservatives object to this Standard variant pronunciation. See -PHTH-. | 1 |
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| | | The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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