p:[sr-]

References ✧ LotR/1114; PE18/94

Phonetic Development

Ilk. initial [s] unvoiced following [l], [r], [w] sr- > r̥- ✧ PE18/094.2107 (sr- > thr-)
OS. initial [s] unvoiced following consonant sr- > r̥- ✧ LotR/1114.2802 (sr- > rh; usually)