An old Quenya name for Beleriand as the home of the Heceldi, but later this name was only used by loremasters (WJ/365). It sometimes appeared in the longer form Heceldamar (WJ/374). It is a compound of Hecel “Elf who stayed in Beleriand” and már “home”.
Quenya
hecel
proper name. Elf who stayed in Beleriand
hecelmar
place name. *Home of the Hecel
A term for the Eldar who remained behind in Beleriand (WJ/365). In Quenya, it became a technical term, rarely used in everyday speech (WJ/374). It was originally derived from hecil “one lost or forsaken”, reformed to Hecel (pl. Heceldi) after the pattern of terms like Oärel (WJ/364).
Conceptual Development: A similar term Ecelli “The Forsaken” appeared in earlier writing (MR/169-170). Ecelli was in all cases replaced by other words: Alamanyar (MR/170) or Sindar (MR/175). Nevertheless, it was probably the precursor to Hecel.