| Kenneth G. Wilson (1923–). The Columbia Guide to Standard American English. 1993. |
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| DIGRAPHS |
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| are two-letter combinations that represent a single sound; English has a great many: oa as in coat, oo as in blood or root or good, au as in jaunt, ea as in steak, ck as in sick, and dozens more. Frequently when people use the word digraphs they refer specifically to the ligatures, those two-letter symbols that are either tied together by overlapping or by having a line (or thread or ligature) tie them together: œ (as in onomatopoeia) and æ (as in mediaeval) are the ligatures most frequently encountered in English, usually conventionally spelled oe and ae. See also DIPHTHONG. | 1 |
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| | | The Columbia Guide to Standard American English. Copyright © 1993 Columbia University Press. |
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