Knowledge base · Part III — Segmental Phonetics, Phonology, and Phonotactics · this topic as a network
19. The Rhotic /r/ and Coda-r
How does the rhotic phoneme /r/ behave in onset and coda positions, and what is its role in morphophonology?
The phoneme /r/ in the consonant inventory
What is the status of /r/ in the consonant inventory, and what characterizes its coda realization?
The phoneme /r/ is a voiced alveolar tap [ɾ], though in the speech of some speakers it is occasionally realized as an alveolar trill [r] (Bugaeva 2012: 466–467). Many consonants contrast in syllable-coda position in Ainu, and the tap /r/ in particular occurs there (Kirikae 1997: 4). The rhotic r approaches d after n, becomes voiceless after k and p, becomes a voiceless fricative after t and sh, and varies according to the preceding vowel in coda position (Kindaichi & Chiri 1936).
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Coda /r/ and the echo-vowel
How is coda /r/ realized with a vocalic release, and what is the echo-vowel?
The phoneme /r/ is realized as a flap [ɾ] intervocalically, and in syllable-final position it is frequently followed by a non-phonemic off-glide vowel echoing the preceding vowel (Refsing 1986: 68). This echo vowel often sounds like a schwa [ə] (Bugaeva 2012: 466–467). Because coda r is an instantaneous tap, the preceding vowel is heard at the end of the syllable: kar sounds like karᵃ, kir like kirⁱ, kur like kurᵘ, ker like kerᵉ, and kor like korᵒ (Kindaichi & Chiri 1936). More precisely, as the vocal folds continue vibrating after the tongue tip taps the alveolar ridge and the tongue restores a posture close to the preceding vowel, an echo-like vowel is repeated before the next syllable begins (Kirikae 1997: 11). Syllable-final r is thus frequently a tap [ɾ] followed by such an echo vowel, though in some speakers or cases a trill may appear instead (Satō 2008: 12). In Hokkaido Ainu, however, the presence or absence of a vowel immediately after /r/ is phonologically clearly distinguished, so that the syllable remains closed (Itabashi 2001). Ainu possesses syllable-final -r in words such as kor 'to have', kar 'to make', and mokor 'to sleep' (reported in Kirikae 1997: 11). In singing or with emphatic intonation, an overt vowel may clearly appear after /-r/, as in [piri:ka] (Nakagawa 2024: 31).
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Devoicing of coda /r/ after voiceless-stop onsets
Under what conditions does coda /r/ become devoiced, and what is its phonetic quality then?
The flap [r] devoices after [k] and [p], devoices and exhibits slight frication after [t], and is devoiced and completely fricated after [ʃ] (Shibatani 1990).
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Dialectal variation and the Sakhalin coda-/r/ reflex
What dialectal variation is observed for coda /r/, and is there a neutralization with /n/?
Sakhalin Ainu shows distinct reflexes of coda /r/ that differ from Hokkaido Ainu. In Sakhalin Ainu, the identical vowel is inserted immediately after /r/, creating an open syllable with no phonological distinction from an open syllable, though in some words /h/ replaces the consonant instead of the +rV pattern (Itabashi 2001). More generally, word-final /r/ in Sakhalin Ainu has become either /h/ or the sequence of /r/ plus a vowel (Shibatani 1990). In Karafuto dialects, a vowel is added to a syllable-final r to create an open syllable, often reduplicating the root vowel or matching the vowel of the Hokkaido affiliative form, as seen in pairs such as nukara/nukar and kisaru/kisar (Tangiku 2022: 9.2). In addition, /r/ in Sakhalin Ainu is described as a plosive-like retroflex [ɽ] or [t], sounding quite different from the Japanese r-sound and sometimes confused with /te/, especially in /re/ (Murasaki 2025: 2). In many Karafuto dialects, word-initial r is changed to t in some lexical items (Tangiku 2022: 9.2), and this tendency is specifically reported for the northern Karafuto Nairo dialect and east-coast dialects such as Ōtani, where forms such as rup/tup and ruh are attested (reported in Tangiku 2022: 9.1).
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