A verb for “to sparkle like jewels” or “to shine like a jewel” serving as the basis for míriel “like a jewel” (PE17/24), which appeared in the poem A Elbereth Gilthoniel (LotR/238).
Sindarin
míria-
verb. to shine like a mîr or jewel
míria-
verb. to sparkle like jewels
_v. _to shine like a mîr or jewel, to sparkle like jewels. Fmîr, míriel