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In phonetics, a trill is a sound produced by vibrations between the active articulator and passive articulator. Standard Spanish as in , for example, is an alveolar trill.
A trill is made by the articulator being held in place and the airstream causing it to vibrate. Usually a trill vibrates for 2–3 contacts, but may be up to 5, or even more if geminate. However, trills may also be produced with only one contact. While single-contact trills are similar to Flap consonant, a tap or flap differs from a trill in that it is made by a muscular contraction rather than airstream. Individuals with ankyloglossia may have issues producing the trill sound.
In addition,
The bilabial trill is uncommon. The coronal trill is most frequently alveolar , but dental consonant and postalveolar articulations and also occur. An alleged retroflex trill found in Toda language has been transcribed (that is, the same as the retroflex flap), but might be less ambiguously written , as only the onset is retroflex, with the actual trill being alveolar. The epiglottal trills are identified by the IPA as fricatives, with the trilling assumed to be allophone. However, analyzing the sounds as trills may be more economical. There are also so-called which are accompanied by epiglottal trill.
The cells in the IPA chart for the velar consonant, (upper) pharyngeal, and glottal places of articulation are shaded as impossible. The glottis quite readily vibrates, but this occurs as the phonation of vowels and consonants, not as a consonant of its own. Dorso-palatal and velar vibratory motions of the tongue are occasionally produced, especially during the release of dorsal stops, and ingressive velar trills occur in snoring, but not in normal speech. The upper pharyngeal tract cannot reliably produce a trill, but the epiglottis does, and epiglottal trills are pharyngeal in the broad sense. A partially devoiced uvular or pre-uvular (i.e. between velar and uvular) trill with some frication occurs as a coda allophone of in the Limburgish dialects of Maastricht and Weert.
Voiceless trills occur phonemically in e.g. Welsh language and Icelandic. (See also voiceless alveolar trill, voiceless retroflex trill, voiceless uvular trill.) Mangbetu and Ninde language have phonemically voiceless bilabial trills.
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 a little like a simultaneous and (or and when devoiced). A symbol for this sound, , has been dropped from the IPA, and it is now generally transcribed as a raised r, .
Yi language ("Cool Mountain" Yi) has two "buzzed" or fricative vowels (written ṳ, i̤) which may also be trilled, .
A number of languages have trilled affricates such as and . The Chapakuran language Wariʼ and the Muran languages language Pirahã have a very unusual trilled phoneme, a voiceless bilabially post-trilled dental stop, .
A nasal trill has been described from some dialects of Romanian, and is posited as an intermediate historical step in rhotacism. However, the phonetic variation of the sound is considerable, and it is not clear how frequently it is actually trilled. Some languages contrast /r, r̃/ like Toro-tegu Dogon and Inor.
Snoring typically consists of vibration of the uvula and the soft palate (velum), which may be described as an ingressive sound velic trill.University of Hawaii Working Papers in Linguistics, 1969, Volume 1, Parts 4–6, Page 115. Like the uvular trill, the ingressive velic trill does not involve the tongue; it is the velum that passively vibrates in the airstream. The Speculative Grammarian has proposed a jocular symbol for the sound (and also the sound used to imitate a pig's snort), a wide O with a double dot (ꙫ), suggesting a pig's snout. The Extensions to the IPA identifies an egressive fricative pronounced with this same configuration, common with a cleft palate, as velopharyngeal , and with accompanying uvular trill as () or ().Unicode support from 2021.
Lateral trills are also possible and may be pronounced by initiating or with an especially forceful airflow. There is no symbol for them in the IPA.
Ejective trills are not known from any language although they are easy to produce. may occur as mimesis of a cat's purr.
| +Attested trilled consonants (excluding secondary phonations and articulations) Sounds in yellow are only attested in disordered speech (extIPA). Sounds in red are only attested from mimesis. |
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