The best known Sindarin word for “snake”, appearing in Appendix E of The Lord of the Rings (LotR/1115). In 1964 notes on Dalath Dirnen (DD), Tolkien said it was derived from the root √LEWEK “worm” (PE17/160), likely from ✱leukā where the ancient eu became ȳ as was usual in Sindarin (LotR/1115).
Noldorin
am-
prefix. snake
lhûg
noun. snake, serpent
amlug
noun. dragon
amlug
noun. dragon
lhanc
noun. throat
lhanc
noun. throat
lhimlug
noun. fish-dragon, sea-serpent
lhûg
noun. dragon
A prefix for “snake” in The Etymologies of the 1930s derived from the root ᴹ√ANGWA of the same meaning, most notably an element in N. amlug “dragon” (Ety/ANGWA).