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plural Ostyaks
(now rare) A member of any of several indigenous peoples in Siberia, Russia, including the Khanty people and the Ket people. quotations
The Ostiacks blister their skin by a fungus found on Birch-trees; and use the Agaricus officin. for Soap.
1789, Erasmus Darwin, The Loves of the Plants, J. Johnson, page 36
(now rare) Any of various languages of these peoples.