
A monophthong (Greek monóphthongos from mónos `single` and phthóngos `sound`) 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. The monophthongs can be contrasted with diphthongs, where the vowel quality changes within the ...
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http://en.wikipedia.org/wiki/Monophthong

• (n.) A combination of two written vowels pronounced as one; a digraph. • (n.) A single uncompounded vowel sound.
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http://thinkexist.com/dictionary/meaning/monophthong/

(from the article `vowel`) ...are gliding vowels in the articulation of which there is a continuous transition from one position to another. Diphthongs are to be contrasted in ...
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http://www.britannica.com/eb/a-z/m/113

In linguistics, Algeo defines this as 'A simple vowel with a single, stable quality' (323) Simon Hor
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http://www.encyclo.co.uk/local/22385
Mon'oph·thong noun [ Greek ... with one sound;
mo`nos alone + ... sound, voice.]
1. A single uncompounded vowel sound.
2. A combination of two written vowels pronounced as one; a digraph.
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http://www.encyclo.co.uk/webster/M/95

a vowel retaining the same quality throughout its duration. Cf.
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https://www.infoplease.com/dictionary/monophthong

A vowel which is articulated with the tongue in a constant position, e.g. /o:/ in German Boot. Most long vowels in German are monophthongs while those in English are diphthongs, e.g. [bəʊt] for boat.
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https://www.uni-due.de/ELE/LinguisticGlossary.html
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