In phonetics, a trill is a consonantal sound produced by vibrations between the articulator and the place of articulation. Standard Spanish <rr> as in perro, for example is an alveolar trill.

Trills are very different from flaps. Whereas with a flap (or tap), a specific gesture is used to strike the active articulator against the passive one, in the case of a trill the articulator is held in place, where the airstream causes it to vibrate. Usually a trill vibrates for 2-3 periods, but may be up to 5, or even more if geminate. However, trills may also be produced with only a single period. While this might seem like a flap, the articulation is different; trills will vary in the number of periods, but flaps do not.

Trill consonants included in the International Phonetic Alphabet:

• [r] - coronal trill
• [ʙ] - bilabial trill
• [ʀ] - uvular trill

The bilabial trill is uncommon. The coronal trill is most frequently alveolar [r͇], but dental and postalveolar articulations [r̪] and [r̠] also occur. An alleged retroflex trill found in Toda has been transcribed [ɽ] (that is, the same as the retroflex flap), but might be less ambiguously written [ɽ͡r], as only the onset is retroflex, with the actual trill being alveolar. One other trill has been reported as a consonant, an epiglottal trill. Epiglottal consonants are often allophonically trilled, and in some languages the trill is the primary realization of the consonant. There is no official symbol for this in the IPA, but occasionally [я] has been used in the literature. There are also so-called strident vowels which are accompanied by epiglottal trill.

The cells in the IPA chart for the velar and pharyngeal places of articulation are shaded. A velar trill is impossible because the middle of the tongue and walls of the throat are insufficiently flexible to vibrate in such a manner.^{[citation needed]} A palatal trill is impractically difficult, if not actually impossible. The glottis quite readily vibrates, but this occurs as the phonation of vowels and consonants, not as a consonant of its own.

The Czech language has two contrastive alveolar trills, one a fricative trill (written ř in the orthography). In the fricative trill the tongue is raised, so that there is audible frication during the trill, sounding rather like a simultaneous [r] and [ʐ]. A symbol for this sound, [ɼ], has been dropped from the IPA, and it is now generally transcribed as a raised r, [r̝].

Liangshan (Cool Mountain) Yi has two "buzzed" or fricative vowels /i̝/, /u̝/ (written ṳ, i̤) which may also be trilled, [ʙ̝], [r̝].

The Chapakuran language Wari’ and the Muran language Pirahã have a very unusual trilled phoneme, a voiceless bilabially post-trilled dental stop, [t̪͡ʙ̥].

Extralinguistic trills[link]

A linguolabial trill [r̼] is not known to be used phonemically, but occurs when blowing a raspberry.

Snoring typically consists of vibration of the uvula and the soft palate (velum). While the former part is simply a uvular trill, there is no standard linguistic term for the latter. It does not constitute a velar trill, because the velum is here the active articulator, not the passive; the tongue is not involved at all. (The Extensions to the IPA identify a fricative pronounced with this same configuration as velopharyngeal.)

Lateral trills are also possible and may be used to imitate bird calls.

See also[link]

• List of phonetics topics
• Bronx cheer (gesture)

References[link]

• Ladefoged, Peter; Maddieson, Ian (1996). The Sounds of the World's Languages. Oxford: Blackwell. ISBN 0-631-19814-8. 

v t e   International Phonetic Alphabet   IPA topics IPA International Phonetic Association History of the IPA Kiel convention (1989) Journal of the IPA (JIPA) Naming conventions Phonetics Diacritics* Segments Tone letter Place of articulation Manner of articulation Special topics Case variants of IPA letters Extensions to the IPA Obsolete and nonstandard symbols IPA chart for English dialects Encodings SAMPA X-SAMPA Conlang X-SAMPA Kirshenbaum TIPA Phonetic symbols in Unicode WorldBet   Consonants v t e IPA pulmonic consonants chartchart image • audio Place → Labial Coronal Dorsal Radical Glottal ↓ Manner Bila​bial Labio​dental Den​tal Alve​olar Post​alv. Retro​flex Pal​a​tal Ve​lar Uvu​lar Pha​ryn​geal Epi​glot​tal Glot​tal Nasal m̥ m ɱ n̪ n̥ n n̠ ɳ ɲ̥ ɲ ŋ̊ ŋ ɴ Stop p b p̪ b̪ t̪ d̪ t d ʈ ɖ c ɟ k ɡ q ɢ ʡ ʔ Fricative ɸ β f v θ ð s z ʃ ʒ ʂ ʐ ç ʝ x ɣ χ ʁ ħ ʕ ʜ ʢ h ɦ Approximant ʋ ɹ ɻ j ɰ Trill ʙ r ɽ͡r ʀ я * Flap or tap ⱱ̟ ⱱ ɾ ɽ ɢ̆ ʡ̯ Lateral Fric. ɬ ɮ ɭ˔̊ ʎ̥˔ ʟ̝̊ ʟ̝ Lateral Appr. l ɭ ʎ ʟ Lateral flap ɺ ɺ̠ ʎ̯ Non-pulmonic consonants Clicks ʘ ǀ ǃ ǂ ǁ ʘ̃ ʘ̃ˀ ʘ͡q ʘ͡qʼ Implosives ɓ ɗ ʄ ᶑ ɠ ʛ Ejectives pʼ tʼ cʼ ʈʼ kʼ qʼ fʼ θʼ sʼ ɬʼ xʼ χʼ tsʼ tɬʼ cʎ̝̥ʼ tʃʼ ʈʂʼ kxʼ kʟ̝̊ʼ Affricates p̪f b̪v ts dz tʃ dʒ tɕ dʑ ʈʂ ɖʐ tɬ dɮ cç ɟʝ cʎ̥˔ kʟ̝̊ Co-articulated consonants Fricatives ɕ ʑ ɧ Approximants ʍ w ɥ ɫ Stops k͡p ɡ͡b ŋ͡m These tables contain phonetic symbols, which may not display correctly in some browsers. [Help] Where symbols appear in pairs, left—right represent the voiceless—voiced consonants. Shaded areas denote pulmonic articulations judged to be impossible. * Symbol not defined in IPA. Chart image Pulmonics Non-pulmonics Affricates Co-articulated   Vowels Front Near-​front Central Near-​back Back Close •iy •ɨʉ •ɯu •ɪʏ •ɪ̈ʊ̈ •ʊ •eø •ɘɵ •ɤo •e̞ø̞ ə •ɤ̞o̞ •ɛœ •ɜɞ •ʌɔ •æ ɐ •aɶ •ä •ɑɒ Near-close Close-mid Mid Open-mid Near-open Open Vowels: IPA help • chart •  chart with audio • view