ᴺS. [ᴱN.] ^irdh n. “entrails, bowels, innards” (Category: Belly, Stomach)
ᴱN. girdh n. “entrails, bowels, inwards” (Category: Belly, Stomach)
A word appearing as ᴱN. girdh in Early Noldorin Word Lists of the 1920s, glossed either “inwards, entrails” (PE13/144) or “entrails, bowels” (PE13/161), with “inwards” being an archaic English variant of “innards” according to the editors. This word was originally a plural form of ᴱN. gir “interior”, from primitive ᴱ✶ʒirdǝ.
Neo-Sindarin: I would adapt this word as ᴺS. irdh “entrails, bowels” for purposes of Neo-Sindarin based on this primitive form, since the ʒ vanished in Sindarin.
References ✧ PE13/144, 161
|gir||“interior, inwards, centre, inner parts, inside, heart”||plural||✧ PE13/144|