Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Qenya 

seler

noun. sister

A noun for “sister” in The Etymologies of the 1930s derived from the root ᴹ√THEL or THELES of the same meaning, with an irregular plural selli (Ety/THEL), where the stem form sell- is because the Quenya syncope caused the second e to be lost and then the ancient ls became ll.

Neo-Quenya: In notes from the late 1960s, Tolkien introduced a new word nésa for “sister” (VT47/14). However, I think seler might be retained to mean a “metaphorical” sister, a close female associate who may or may not be related by blood, as with such words as meletheldi “love-sister, ✱close female friend” or ᴹQ. oselle “sworn sister”. In this sense, nésa would be limited to biological relationships, but seler would refer to sisterly (or sister-like) affection.

Cognates

  • On. thele “sister” ✧ Ety/THEL
  • N. thêl “sister” ✧ Ety/THEL

Derivations

  • ᴹ√THEL(ES) “sister” ✧ Ety/THEL

Element in

  • ᴹQ. oselle “[sworn] sister, associate [f.]” ✧ Ety/THEL

Phonetic Developments

DevelopmentStagesSources
ᴹ√THELES > seler[tʰeles] > [θeles] > [θeler] > [seler]✧ Ety/THEL