- Paleosiberian⇄adj. of or having to do with the Paleosiberians or their languages. Also, Palaeosiberian.
- Paleosiberian⇄noun (Especially U.S.)1. any one of a number of aboriginal peoples of northeastern Siberia speaking languages that do not belong to any of the large language families.
2. the group of languages spoken by these peoples. - Paleosiberian⇄Paleosiberian, noun, adjective.