R -R the letter (or sound) r, used as euphonic consonant to avoid hiatus. The sandhi -r- originates from the final -r- of nouns in °ir and °ur of the Vedic period. In Pāli it is felt as euphonic consonant only, like other sandhi consonants (-y- for instance) which in the older language were part of the noun itself. Thus r even where it is legitimate in a word may interchange with other sandhi-consonants in the same word, as we find puna-m-eva and puna-d-eva besides the original puna-r-eva (= Vedic punar eva). At Ja I 403 we read "punar āgata," where the commentary explains "puna āgata, ra-kāro sandhi-vasena vutto." Similarly: Snp 81 (vutti-r-esā), 214 (thambho-r-iva), 625 = Dhp 401 (āragge-r-iva), 679 (ati-r-iva), 687 (sarada-r-iva), 1134 (haṃsa-r-iva); Vv 64 22 (Vajirāvudho-r-iva); Pv II 8 7 (puna-r-eva); II 11 6 (the same); Pv-a 77 (su-r-abhigandha). In the latter cause the r has no historical origin, as little as in the phrase dhir atthu (for *dhig-atthu) Snp 440; Ja I 59.
巴利文字母表的羅馬化拼音第二十七個輔音字母。發音好像漢語中的 r。