The form helta- in the Etymologies is a misreading according to VT/46:14
Noldorin
an-
prefix. with, by
an-
prefix. with, by
a-
prefix. intensive prefix
an
preposition. of
anna-
verb. to give
anc
noun. jaw, row of teeth
ann
adjective. long
an(d)fang
proper name. Longbeard
anann
adverb. long
anc
noun. jaw, row of teeth
anfalas
place name. Langstrand
ann
adjective. long
dae
adverb. very
heltha-
verb. to strip
iaur
adjective. ancient, old, original
iaur
adjective. older, former
mell
adjective. dear
mell
adjective. dear
muin
adjective. dear
muin
adjective. dear
na
preposition. with, by (also used as a genitive sign)
na
preposition. to, towards, at
naew
noun. jaw
naew
noun. jaw
A noun for “jaw” in The Etymologies of the 1930s derived from primitive ᴹ✶nakma (✱“bite-thing”) under the root ᴹ√NAK “bite” (NAK). This word remains phonologically plausible in Sindarin, with ancient k vocalizing to i and the resulting diphthong ai become ae, after which the m became v > w; see VT42/26 for a description of the basic phonetic changes. However, naew might have been displaced conceptually by anc “jaw”, which appeared in a number of later Sindarin names and whose Quenya cognate Q. anca appeared in The Lord of the Rings Appendix E.
nan
preposition. of
taen
adjective. long (and thin)
A noun in The Etymologies of the 1930s glossed “jaw, row of teeth” derived from the root ᴹ√(A)NAK “bite” (Ety/ÁNAK, NAK). The continued appearance of words like Anfauglir “Jaws of Thirst” (S/180) and its Quenya cognate Q. anca (LotR/1123) indicate its ongoing validity.
Conceptual Development: G. gag “jaw” from the Gnomish Lexicon of the 1910s (GL/37) might be a conceptual precursor.