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From our dictionary:
at•a•vis•tic
(at"u•vis'tik),
—adj.
of, pertaining to, or characterized by atavism; reverting to or suggesting the characteristics of a remote ancestor or primitive type.
(at"u•vis'tik),
—adj.
of, pertaining to, or characterized by atavism; reverting to or suggesting the characteristics of a remote ancestor or primitive type.
