Sindarin 

Argonath

noun. royal stones

arn (prefix “royal”) + gond (“great stone, rock”) + ath (collective plural suffix). Triconsonantal cluster rgn produces rg; in this case original nd doesn’t produce nn before the collective plural suffix ath. #It might be a dialectal form or a mistake on the part of Gondorians who didn't always use Elvish languages correctly (VT42 “Rivers and Beacon-hills”).

Sindarin [Tolkiendil] Group: Tolkiendil Compound Sindarin Names. Published by

Argonath

Argonath (name)

The name is Sindarin and is composed as arn "royal" + gond "stone". The ending -ath is a collective plural, used sometimes (perhaps irregularly) for dual.

Sindarin [Tolkien Gateway "Argonath"] Published by

Argonath

Argonath

The name is Sindarin and is composed of ar "royal" plus gond "stone". The ending -ath is a collective plural, used sometimes (perhaps irregularly) for dual.

Sindarin [Tolkien Gateway] Published by