Dictionary![]() ![]() the•ri•anPronunciation: (thēr'ē-un), [key] —adj. (in some classification systems) belonging or pertaining to the group Theria, comprising the marsupial and placental mammals and their extinct ancestors. —n. a therian animal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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