Voiceless alveolar fricative

• A voiceless alveolar sibilant (the standard symbol in the International Phonetic Alphabet or IPA) has a strong hissing sound, as the s in English sink. It is one of the most common sounds in the world.
• A voiceless denti-alveolar sibilant or (an ad hoc notation), also called apico-dental, has a weaker lisping sound like English th in thin. It occurs in Spanish dialects in southern Spain (eastern Andalusia).
• A voiceless alveolar retracted sibilant , and the subform apico-alveolar , has a weak hushing sound (also called "grave" frication) reminiscent of retroflex fricatives. It is used in the languages of northern Iberia, like Asturleonese, Basque, Peninsular Spanish (excluding parts of Andalusia), Catalan, Galician, and Northern European Portuguese. A similar retracted sibilant form is also used in Dutch, Icelandic, some southern dialects of Swedish, Finnish, and Greek. The retracted "S" is also used in Amerindian languages such as Muscogee, Garifuna, and many varieties of Quechua. It was supposedly the standard sound of s in Classical Latin. Its sound is between and [].
• A voiceless alveolar non-sibilant fricative or (using the alveolar diacritic from the Extended IPA) is similar to the th in English thin. It occurs in Icelandic as well as an intervocalic and word-final allophone of English in dialects such as Hiberno-English and Scouse.
• A voiceless alveolar lateral fricative sounds like a voiceless, strongly articulated version of English l (somewhat like what the English cluster **hl would sound like) and is written as ll in Welsh.

The first three types are sibilants, meaning that they are made by directing a stream of air with the tongue towards the teeth and have a piercing, perceptually prominent sound.

Voiceless alveolar sibilant

A voiceless alveolar sibilant is a common consonant sound in spoken languages. It is the sound in English words such as sea and pass, and is represented in the International Phonetic Alphabet with ⟨⟩. It has a characteristic high-pitched, highly perceptible hissing sound. For this reason, it is often used to get someone's attention, using a call often written as sssst! or psssst!.

Voiceless alveolar sibilants are one of the most common sounds cross-linguistically. If a language has fricatives, it will most likely have . However, some languages have a related sibilant sound, such as , but no . In addition, sibilants are absent from most Australian Aboriginal languages, in which fricatives are rare; however, does occur in Kalaw Lagaw Ya.

Features

Features of a voiceless alveolar sibilant:

• Its manner of articulation is sibilant (a subclass of fricatives and affricates), which means it is generally produced with a higher-frequency turbulence. Sibilants may be articulated with various tongue shapes and degrees of palatalization, depending on their place of articulation.
• There are at least three specific variants of :
  • Dentalized laminal alveolar (commonly called "dental"), which means it is articulated with the tongue blade very close to the upper front teeth, with the tongue tip resting behind lower front teeth. The hissing effect in this variety of is very strong.
  • Non-retracted alveolar, which means it is articulated with either the tip or the blade of the tongue at the alveolar ridge, termed respectively apical and laminal. According to Ladefoged & Maddieson (1996) about half of English speakers use a non-retracted apical articulation.
  • Retracted alveolar, which means it is articulated with either the tip or the blade of the tongue slightly behind the alveolar ridge, termed respectively apical and laminal. Acoustically, it is close to laminal or (to a lesser extent) .
• Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
• It is an oral consonant, which means that air is not allowed to escape through the nose.
• It is a median consonant, which means it is produced by directing the airstream down the midline of the tongue, rather than to the sides.
• Its airstream mechanism is pulmonic, which means it is articulated by pushing air only with the intercostal muscles and abdominal muscles, as in most speech sounds.

Occurrence

Dentalized laminal alveolar

Alveolar

Retracted alveolar