elenya adj. *"stellar" (only defined as an adjective referring to stars by Tolkien) (WJ:362). Cf. Elenya, name of the first day of the Eldarin six-day week, dedicated to the stars (Appendix D).
Primitive elvish
elenyā
adjective. elenyā
elenā
adjective. connected with or concerning the stars
An “adjective referring to the stars” mentioned in the Quendi and Eldar essay of 1959-60, hence “✱of the stars” or “✱stellar” (WJ/362), replacing the more ancient adjective form ✶elenā which after various sound changes became confused with Q. Elda “Elf” (WJ/360, 362). As a proper name, Q. Elenya happens to be the Elvish name for “Saturday”, more literally “✱Star-day” (LotR/1110).