ˈdīəˌfōn noun
( -s )
Etymology: dia- + -phone
1. : all the variants of a phoneme that occur in all utterances of all speakers of a language
in French the tongue-trilled r used by some speakers and the uvula-trilled r used by other speakers belong to the same diaphone
2. : a fog signal similar to a siren
3. : a powerful pipe-organ stop of peculiar construction of 8-foot, 16-foot, or 32-foot pitch