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In linguistics, a consonant cluster or consonant sequence is a group of consonants which have no intervening vowel. In English, for example, the groups and are consonant clusters in the word ''splits''. Some linguists argue that the term can only be properly applied to those consonant clusters that occur within one syllable. Others contend that the concept is more useful when it includes consonant sequences across syllable boundaries. According to the former definition, the longest consonant clusters in the word ''extra'' would be and ,〔J.C. Wells, (''Syllabification and allophony'' )〕 whereas the latter allows or in some dialects. == Phonotactics == Languages' phonotactics differ as to what consonant clusters they permit. Many languages are more restrictive than English in terms of consonant clusters. Many languages forbid consonant clusters entirely. Hawaiian, like most Malayo-Polynesian languages, is of this sort. Japanese is almost as strict, but allows a sequence of a nasal or approximant, plus another consonant, as in ''Honshū'' (the name of the largest island of Japan), and ''Tokyo'' . Standard Arabic forbids initial consonant clusters and more than two consecutive consonants in other positions. So do most other Semitic languages, although Modern Israeli Hebrew permits initial two-consonant clusters (e.g. ''pkak'' "cap"; ''dlaat'' "pumpkin"), and Moroccan Arabic, under Berber influence, allows strings of several consonants.〔The extent of consonant clusters in Moroccan Arabic depends on the analysis. Richard Harrell's grammar of the language postulates schwa sounds in many positions that do not occur in other analyses. For example, the word that appears as ''ktbu'' "they wrote" in Jeffrey Heath's ''Ablaut and Ambiguity: Phonology of a Moroccan Arabic Dialect'' appears as ''ketbu'' in Harrell's grammar.〕 Like most Mon–Khmer languages, Khmer permits only initial consonant clusters with up to three consonants in a row per syllable. Finnish has initial consonant clusters natively only on South-Western dialects and on foreign loans, and only clusters of three inside the word are allowed. Most spoken languages and dialects, however, are more permissive. In Burmese, consonant clusters of only up to three consonants (the initial and two medials—two written forms of , ) at the initial onset are allowed in writing and only two (the initial and one medial) are pronounced. These clusters are restricted to certain letters. Some Burmese dialects allow for clusters of up to four consonants (with the addition of the medial, which can combine with the above-mentioned medials. At the other end of the scale, the Kartvelian languages of Georgia are drastically more permissive of consonant clustering. Clusters in Georgian of four, five or six consonants are not unusual—for instance, (''flat''), (''trainer'') and (''peeling'')—and if grammatical affixes are used, it allows an eight-consonant cluster: (''he's plucking us''). Consonants cannot appear as syllable nuclei in Georgian, so this syllable is analysed as CCCCCCCCVC. The neighboring, but unrelated Armenian language also allows for long consonant strings. For example, the classic transliterations ''k̕rt̕mndzhal'' and ''khghchmtank̕'' of քրթմնջալ ("to grumble") and խղճմտանք ("conscience") start with eight consonants, though in the Armenian alphabet and the modern ISO 9985 transliteration words starting with more than six consonants are rare. Many Slavic languages may manifest almost as formidable numbers of consecutive consonants, such as in the Slovak words ''štvrť'' ("quarter"), and ''žblnknutie'' ("clunk"; "flop") and the Slovene word ''skrbstvo'' ("welfare"). However, the liquid consonants /r/ and /l/ can form syllable nuclei in West and South Slavic languages and behave phonologically as vowels in this case. An example of a true initial cluster is the Polish word ''wszczniesz'' ( ("you will initiate"). In the Serbo-Croatian word ''opskrbljivanje'' ("victualling") the and are digraphs representing single consonants: and , respectively. Some Salishan languages exhibit long words with no vowels at all, such as the Nuxálk word : ''he had had in his possession a bunchberry plant''. It is extremely difficult to accurately classify which of these consonants may be acting as the syllable nucleus, and these languages challenge classical notions of exactly what constitutes a syllable. The same problem is encountered in the Northern Berber languages. There has been a trend to reduce and simplify consonant clusters in East Asian languages, such as Chinese and Vietnamese. Old Chinese was known to contain additional medials such as /r/ and/or /l/, which yielded retroflexion in Middle Chinese and today's Mandarin Chinese. The word 江, read as jiang in Mandarin and kong in Cantonese, was most likely klong or krung. Additionally, initial clusters such as "tk" and "sn" were analysed in recent reconstructions of Old Chinese, and some were developed as palatalised sibilants. Another element of consonant clusters in Old Chinese were analysed in coda and post-coda position. Some "departing tone" syllables have cognates in the "entering tone" syllables, which feature a -p, -t, -k in Middle Chinese and Southern Chinese varieties. The departing tone was analysed to feature a post-coda sibilant, "s". Clusters of -ps, -ts, -ks, were then formed at the end of syllables. These clusters eventually collapsed into "-ts" or "-s", before disappearing altogether, leaving elements of diphthongisation in more modern varieties. Old Vietnamese also had a rich inventory of initial clusters, but these were slowly merged with plain initials during Middle Vietnamese, and some have developed into the palatal nasal. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「consonant cluster」の詳細全文を読む スポンサード リンク
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