ᴺS. [G.] ^fidhras n. “collective hair, *all hair on the body” (Category: Hair (other))
G. fidhra n. “collective hair” (Category: Hair (other))
A noun appearing as G. fidhra “collective hair” in the Gnomish Lexicon of the 1910s (GL/35) clearly derived from the early root ᴱ√FIŘI [FIÐI] (QL/38). It may refer to “*all hair on the body” given its elaboration G. fidhrad “hairy, hirsute”.
Neo-Sindarin: I would adapt this word as ᴺS. fidhras, generalized from the adjective ᴺS. fidhren “having hair”.
Reference ✧ GL/35 ✧ fiðra “collective hair”