Sindarin 

-reth

suffix. -reth

suff. >> Orodreth

Sindarin [(PE17 Sindarin Corpus) PE17:182] < RETE climb. Group: Parma Eldalamberon 17 Sindarin Corpus. Published by

reth

noun. *climber

Sindarin [PE17/182] Group: Eldamo. Published by

Quenya 

retto

noun. *climber