Voiced alveolar approximant (ɹ)

Articulation and characteristics

As an approximant, the voiced alveolar approximant is produced with a relatively wide oral passage compared with fricatives or stops. The tip or blade of the tongue approaches the alveolar ridge (the gum line just behind the upper front teeth) without making a complete closure. Air flows smoothly, and voicing is present: the vocal cords vibrate throughout the articulation. Phoneticians describe core features as:

• Place: near the alveolar region;
• Manner: approximant (no turbulent noise);
• Phonation: voiced.

Variants

There is phonetic variation in how the sound is realized. Some speakers use a tongue-tip or retroflex posture, others a bunched or domed tongue body that raises toward the postalveolar region. Because of these differences it is sometimes described together with the postalveolar approximant under a single IPA symbol. Different dialects and accents may favor one articulatory configuration over another.

Distribution, examples and function

The sound occurs in many languages and in a wide range of accents; it is especially familiar to speakers of rhotic varieties of English. It typically serves as a distinct phoneme that contrasts with other rhotic sounds such as taps, trills, or retroflex approximants. In orthographies the sound is commonly represented by the letter r, though actual pronunciation may vary significantly between languages and dialects; some languages that historically had an r have shifted to other rhotic realizations.

Notation and related symbols

In the International Phonetic Alphabet the voiced alveolar and nearby postalveolar approximants are commonly transcribed with the symbol ⟨ɹ⟩, a turned lowercase r. In some practical or broad transcriptions writers use the plain letter ⟨r⟩ for convenience, and in ASCII-based systems the X-SAMPA symbol is ⟨r\\⟩. Where precision is required, diacritics or alternate symbols indicate retroflex or bunched variants.

Distinctions and notes

The voiced alveolar approximant should not be confused with the alveolar trill [r] or the alveolar tap [ɾ], which involve a very different tongue motion and acoustic result. Phonologically, languages differ in whether they contrast several rhotic sounds or treat them as allophones of a single phoneme. For an introduction to related terms and comparative descriptions see additional phonetic resources and studies of rhotic consonants in different languages and dialects (languages).