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Sibilants (from Latin: sībilāns : 'hissing') are fricative consonants of higher amplitude and pitch, made by directing a stream of air with the tongue towards the teeth.[1] Examples of sibilants are the consonants at the beginning of the English words sip, zip, ship, and genre. The symbols in the International Phonetic Alphabet used to denote the sibilant sounds in these words are, respectively, [s] [z] [ʃ] [ʒ]. Sibilants have a characteristically intense sound, which accounts for their paralinguistic use in getting one's attention (e.g. calling someone using "psst!" or quieting someone using "shhhh!").
In the alveolar hissing sibilants [s] and [z], the back of the tongue forms a narrow channel (is grooved) to focus the stream of air more intensely, resulting in a high pitch. With the hushing sibilants (occasionally termed shibilants), such as English [ʃ], [tʃ], [ʒ], and [dʒ], the tongue is flatter, and the resulting pitch lower.[2][3]
A broader category is stridents, which include more fricatives than sibilants such as uvulars. Sibilants are a higher pitched subset of the stridents. The English sibilants are:
while the English stridents are:
as /f/ and /v/ are stridents but not sibilants because they are lower in pitch.[4][5]
Some linguistics use the terms stridents and sibilants interchangeably to refer to the greater amplitude and pitch compared to other fricatives.[6]
"Stridency" refers to the perceptual intensity of the sound of a sibilant consonant, or obstacle fricatives or affricates, which refers to the critical role of the teeth in producing the sound as an obstacle to the airstream. Non-sibilant fricatives and affricates produce their characteristic sound directly with the tongue or lips etc. and the place of contact in the mouth, without secondary involvement of the teeth.[citation needed]
The characteristic intensity of sibilants means that small variations in tongue shape and position are perceivable, with the result that there are many sibilant types that contrast in various languages.
Fricatives involve turbulent airflow caused by at least two articulators being closed together. There are two main kinds, sibilants, which are high-pitched fricative sounds, and non-sibilants, which have a low-pitched sound. The sibilants in English are /s, z, ʒ, ʃ, ʒ/. The non-sibilants are /f, v, θ, ð, h/.
A substet of consonants, the production of which includes some amount of frication, is assigned the feature [+sibilant]. These consonants are /s, z, ʒ, tʃ, dʒ/. Some linguists also refer to them as stridents. The two terms are used interchangeably.