What is "kuydusun"

Kuydusun is a rural locality (a selo) in Borogonsky 2-y Rural Okrug of Oymyakonsky District in the Sakha Republic, Russia, located from Ust-Nera, the administrative center of the district, and from Tomtor, the administrative center of the rural okrug. Its population as of the 2002 Census was 139.