A Sindarin word appearing in documents from 1959, a melding of primitive ✶srawā “body” and ✶srāwe “flesh”, both based on the root √SRAW (MR/349-350). It reappeared in notes from 1968 with just the gloss “flesh” as a derivative for primitive srā (VT47/12).
Neo-Sindarin: For purposes of Neo-Sindarin, I would only use rhaw for “flesh” (of a living body), and would retain the 1957 word S. rhond for “body”; see that entry for discussion.
This word appeared as rhaw(f) in notes from the late 1960s with Quenya cognates Q. hráva “wild” and Q. hravan “wild beast”, all derived from the root √S-RAB “wild” (PE17/78). In this document rhaw(f) served as the basis for Rhovanion “Wilderland”. In notes from 1969, rhaw (< rhawf) reappeared with the gloss “wild beast” and a peculiar plural form i·rhaw (PE23/139). Elsewhere Tolkien said words with the diphthong au became oe in the plural (PE17/25), such as noeg plural of naug “dwarf” (UT/100). The [[s|loss of final f [v] after the u-diphthong au]] is the usual Sindarin development.
Conceptual Development: N. rhaw appeared in The Etymologies of the 1930s derived from primitive ᴹ✶rāba “wild, untamed” under the root ᴹ√RAB (Ety/RAB). Christopher Tolkien glossed this word as “wilderness” in The Etymologies as published in The Lost Road (LR/382), but in their Addenda and Corrigenda to the Etymologies Carl Hostetter and Patrick Wynne indicate this gloss actually applied to N. rhofan (VT46/10), meaning the adjective likely had the same meaning as its primitive form: “wild, untamed”. In The Etymologies, the primitive *r* unvoiced to *rh* as was typical for Noldorin, and it seems in the 1960s Tolkien revised the root for this word to √S-RAB so that the Sindarin form would still begin with rh.
Neo-Sindarin: For purposes of Neo-Sindarin, I assume this word can be used as both an adjective “wild, untamed” or a noun “wild beast”, but I would assume its plural form is rhoef to be consistent with Sindarin plurals appearing elsewhere, with the final -f preserved in the plural since it no longer followed a u-diphthong.