Quenya 

ret-

verb. to climb

A neologism for “to climb” coined by Helge Fauskanger for his NQNT (NQNT) based on the root √RET of the same meaning.

Quenya Group: Eldamo - neologism/reconstructions. Published by

retto

climber

retto "climber" (PE17:182, language unidentified). The form is mentioned as somehow related to the Sindarin element -reth in Orodreth ("Mountain-climber") and could be either Old Sindarin or the Quenya cognate. *Ret- might then be the Quenya verb for "climb", a derivative of the root RETE of similar meaning.