digraphic
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di·graph
(dī′grăf′)n.
1. A pair of letters representing a single speech sound, such as the ph in pheasant or the ea in beat.
2. A single character consisting of two letters run together and representing a single sound, such as Old English æ.
di·graph′ic (dī-grăf′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.