monophthong

This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (April 2008)

A monophthong (Greek μονόφθογγος, "monophthongos" = single note) is a "pure" vowel sound, one whose articulation at both beginning and end is relatively fixed, and which does not glide up or down towards a new position of articulation; compare diphthong.

The conversion of monophthongs to diphthongs (diphthongization) or of diphthongs to monophthongs (monophthongization), is a major element of language change and is likely the cause of further changes. Some sounds that may be perceived by native speakers as monophthongs in English are, in fact, diphthongs; the vowel sound in pay — pronounced /ˈpeɪ/ is an example of this. Some dialects of English make monophthongs out of former diphthongs. The vowel boat is generally realized as a diphthong [əʊ] or [oʊ]. Also, the speech of the southern United States tends to alter the diphthong /aɪ/ as in eye to an [aː] somewhere between /ɑ/ and /æ/. On the other hand, former monophthongs have become diphthongs in American English such as the /ɪ/ in words like pin changing to [ɪə] in some American dialects.

Historically, some languages treat vowel sounds that were formerly diphthongs as monophthongs. Such is the case in Sanskrit, in whose grammar the sounds now realised as /e/ and /o/ are conceptually ai and au, and are written that way in the Devanagari and related alphabets. The sounds /ai/ and /au/ exist in Sanskrit, but are written as if they were āi and āu, with long initial vowels. Similar processes of the creation of new monophthongs from old diphthongs are preserved in the traditional spellings of languages as diverse as French and modern Greek.

See also

• Vowel
• Diphthong
• Triphthong
• List of vowels
• List of phonetics topics