pl1. mrbin, pl2. morbennath n. 'Dark-elf', excluding the Sindar.
Sindarin
morben
proper name. *Dark-folk
morben
'Dark-elf'
morben
noun. a dark person
morn (“dark”) + pen (“someone, anyone”) is said to be “formally” related to Q Moriquendi; the first element could be mora-, after kala- in Kalaquendi.
morben
noun. one of the Avari or Easterlings in Beleriand
morbenedh
'Dark-Elf'
pl1. morbenidh {ð} n. #'Dark-Elf'. >> penedh
morbenedh
proper name. *Dark-elf
Moredhel
'Dark-Elf'
pl1. Moredhil {ð} n. 'Dark-Elf', distinguished from the Sindar (and usually also the Nandor). Q. Avar.
moravar
noun. 'Dark-Elf'
n. #'Dark-Elf'.
mornedhel
dark elf
Mornedhel (i Vornedhel), pl. Mornedhil (i Mornedhil). Conceivably the entire word could be umlauted in the pl.: Mernedhil. (WJ:409). Also Duredhel (i Dhuredhel), pl. Duredhil (i Núredhil), also called Durion (i Dhurion), *"dark son", pl. Duryn (i Nuryn), coll. pl. Durionnath.
mornedhel
dark elf
Mornedhel (i Vornedhel), pl. Mornedhil (i Mornedhil). Conceivably the entire word could be umlauted in the pl.: ?Mernedhil. (WJ:409) Another term for ”Dark Elf” is Dúredhel (i Dhúredhel), pl. Dúredhil (i Núredhil).
mornedhel
dark elf
(i Vornedhel), pl. Mornedhil (i Mornedhil). Conceivably the entire word could be umlauted in the pl.: Mernedhil. (WJ:409). Also Duredhel (i Dhuredhel), pl. Duredhil (i Núredhil), also called Durion (i Dhurion), ✱"dark son", pl. Duryn (i Nuryn), coll. pl. Durionnath.
Originally a Sindarin term for the dark-elves (PE17/141), it was later expanded to include anyone who was not a Calben, ally of the Light (WJ/376). This name is a combination of morn “black” and pen “(some)one” (WJ/362).
Conceptual Development: The (rejected) word Morbenn appeared in The Etymologies from the 1930s (EtyAC/MOR).