The correlative ᴹQ. indon “as” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/111), a combination of the relative pronoun ᴹQ. i and the similative suffix ᴹQ. -ndon.
Qenya
anda
adjective. long
andamunda
noun. elephant
andatehta
noun. long mark
andatelko
noun. long stem, long leg
andave
adverb. *long
anda né
long ago
ando
adverb. long
á e·ndanne anda né
Oh! he went back long ago
an-
prefix. intensive prefix
indon
conjunction. as
A noun for “elephant” in The Etymologies of the 1930s, a combination of ᴹQ. anda “long” and an adjectival form of ᴹQ. mundo “snout” (Ety/MBUD), hence literally “long snouted”.
Conceptual Development: In the Qenya Lexicon of the 1910s, Tolkien gave ᴱQ. hunto “elephant” (QL/41).