Digraph (orthography)
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A digraph or bigraph is a pair of letters used to write one sound or a combination of sounds that does not correspond to the written letters combined. This is often, but not necessarily, a sound (or more precisely a phoneme) which cannot be expressed using a single letter in the alphabet used for writing.
Sometimes, when digraphs do not represent a new phoneme, they are a relic from an earlier period in the language's history when they did (or remain phonemic only in certain dialects, e.g. wh in English).
Some schemes of transliteration into the Roman alphabet make extensive use of digraphs (e.g. Cyrillic to Roman for English readers), while others rely solely on diacritics (e.g. Cyrillic to the modified Roman used for Turkish). To avoid ambiguity, transliteration based on diacritics is generally preferred in academic circles. Many writing systems, like Cyrillic and Devanagari, have no digraphs, and so transliterations into languages using them also cannot use digraphs.
There are three kinds of digraphs: sequences, reversals (really a special kind of sequence) and doubled letters.
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Sequences
This is a group of two letters, both of which are different.
Examples from languages include:
- Basque
- tx, corresponds to Template:IPA (voiceless postalveolar affricate)
- Czech
- ch, corresponds to Template:IPA (voiceless velar fricative)
- dž, corresponds to Template:IPA (voiced postalveolar affricate), it occurs almost in words of foreign origin (e. g. džem Template:IPA, jam).
- Dutch
- ch, corresponds to Template:IPA (voiceless velar fricative)
- eu, corresponds to Template:IPA (close-mid front rounded vowel)
- ie, corresponds to Template:IPA (close front unrounded vowel)
- ng, corresponds to Template:IPA (velar nasal)
- oe, corresponds to Template:IPA (close back rounded vowel)
- sj, corresponds to Template:IPA (voiceless postalveolar fricative)
- English
- ch, usually corresponds to Template:IPA (voiceless postalveolar affricate), less often to Template:IPA (voiceless postalveolar fricative)
- wh, corresponds to Template:IPA (voiceless labial-velar fricative; see also hwair)
- th, usually corresponds to Template:IPA (voiceless interdental fricative) or Template:IPA, (voiced interdental fricative)
- sh, corresponds to Template:IPA, (voiceless postalveolar fricative)
- ng, corresponds to Template:IPA (velar nasal)
- kn, corresponds to Template:IPA (alveolar nasal)
- ph, corresponds to Template:IPA (voiceless labiodental fricative)
- gh, corresponds to Template:IPA (voiceless labiodental fricative) or is silent
- ck, corresponds to Template:IPA (voiceless velar plosive)
- ea, ie, ei correspond mostly to Template:IPA (close front unrounded vowel)
- ai, ay correspond mostly to Template:IPA (diphthong: close-mid front unrounded vowel followed by close front unrounded vowel)
- ue corresponds to Template:IPA (close back unrounded vowel)
- French
- ai, corresponds to Template:IPA (open-mid front unrounded vowel)
- au, corresponds to Template:IPA (close-mid back rounded vowel)
- ch, corresponds to Template:IPA (voiceless postalveolar fricative)
- ou, corresponds to Template:IPA (close back rounded vowel) or Template:IPA (labio-velar approximant)
- gn, corresponds to Template:IPA (palatal nasal)
- qu, corresponds to Template:IPA (voiceless velar stop), typically before historic front vowels
- See also French phonology
- German
- ae, as ä, corresponds to Template:IPA (open-mid front unrounded vowel)
- ch, corresponds to Template:IPA (voiceless velar fricative) or Template:IPA (voiceless palatal fricative)
- ck, corresponds to Template:IPA (voiceless velar plosive)
- ei, corresponds to Template:IPA (open front unrounded vowel) followed by (near-close near-front unrounded vowel)
- eu, corresponds to Template:IPA (open-mid back rounded vowel) followed by (near-close near-front rounded vowel)
- oe, as ö, corresponds to Template:IPA (open-mid front rounded vowel) or Template:IPA (close-mid front rounded vowel)
- ss, as ß, corresponds to Template:IPA (voiceless alveolar fricative)
- ue, as ü, corresponds to Template:IPA (close front rounded vowel) or Template:IPA (near-close near-front rounded vowel)
- Italian
- gl, corresponds to Template:IPA, palatal lateral approximant, before -i (with some exceptions)
- gn, corresponds to Template:IPA (palatal nasal)
- sc corresponds to Template:IPA, (voiceless postalveolar fricative) before -i and -e (but to Template:IPA before other letters)
- ch corresponds to Template:IPA (only used before i, e)
- gh corresponds to Template:IPA (only used before i, e)
- Modern Greek
- αι (ai), corresponds to Template:IPA
- ει (ei), corresponds to Template:IPA
- οι (oi), corresponds to Template:IPA
- ου (ou), corresponds to Template:IPA
- γκ (gk), corresponds to Template:IPA
- μπ (mp), corresponds to Template:IPA
- ντ (nt), corresponds to Template:IPA
Some of the above depend on context — see Greek alphabet.
- Portuguese
- ch corresponds to Template:IPA
- lh corresponds to Template:IPA, palatal lateral approximant
- nh corresponds to Template:IPA (palatal nasal)
- qu corresponds to Template:IPA
- sc
- xc
- Serbian, Croatian
- lj corresponds to Template:IPA, palatal lateral approximant
- nj corresponds to Template:IPA (palatal nasal)
- dž corresponds to Template:IPA (voiced postalveolar affricate)
- Thai (transcription system)
- kh, corresponds to Template:IPA
- ph, corresponds to Template:IPA
- th, corresponds to Template:IPA
- ng, corresponds to Template:IPA
- Welsh
- ch, corresponds to Template:IPA (voiceless uvular fricative), similar to French "r"
- ng, corresponds to Template:IPA (velar nasal), the same sound as in English
- ph, corresponds to Template:IPA (voiceless labiodental fricative)
- rh, corresponds to Template:IPA a voiceless R, pronounced roughly like the English combination HR
- th, corresponds to Template:IPA (voiceless interdental fricative)
Reversals
Reversals are sequences in which both possible orders of letters are common enough to be digraphs.
- English
- re corresponds to Template:IPA
- le corresponds to Template:IPA
Doubled letters
These have both letters the same. In some languages these indicate length, a stressed syllable or a new sound, and in some cases they are just part of the spelling convention. Ll is the most common in English, though it does not represent a different sound, but that is not the case in other languages; Welsh's ll is a voiceless lateral, and in Spanish it is a palatal lateral approximant Template:IPA or else a palatal fricative. Ee and oo are common examples from English. Rr in Spanish and Portuguese indicates a trill, and forms a minimal pair with the single r. Italian's zz represents the affricate Template:IPA.
- English
- ll corresponds to Template:IPA (voiced alveolar lateral approximant)
- ee corresponds to Template:IPA (close front unrounded vowel)
- oo corresponds to Template:IPA (close back unrounded vowel)
- Dutch
- aa corresponds to Template:IPA (open front unrounded vowel)
- ee corresponds to Template:IPA (close-mid front unrounded vowel)
- oo corresponds to Template:IPA (close-mid back rounded vowel)
- uu corresponds to Template:IPA (close front rounded vowel)
- CC (where C means any consonant) corresponds to C and signifies that the preceding vowel is short.
- Welsh
- dd, a voiced dental fricative, like English then
- ff, the voiceless labiodental fricative, Template:IPA (like English f, as Welsh F is pronounced like English V)
- ll, a voiceless alveolar lateral fricative, Template:IPA
In Czech (and analogically in other Slavic languages) doubled letters occur in word-formation by prefixes and suffixes, and in composite words. Therefore, doubled letters are not considered as digraphs in Czech. Examples:
- bezzubý (toothless)
- cenný (valuable)
- černooký (black-eyed)
See also
cs:Spřežkový pravopis da:Digraf de:Digraph (Linguistik) es:Dígrafo fr:Digramme gl:Dígrafo io:Digramo it:Digrafo (ortografia) nl:Digraaf ja:二重音字 no:Digraf pt:Dígrafo sv:Digraf