atavismn.
英 'ætəvɪzəm | 美 'ætə,vɪzəm
中文n. 返祖现象；隔代遗传
词根词源
atavism (n.)1833, from French atavisme, attested by 1820s, from Latin atavus "ancestor, forefather," from at- perhaps here meaning "beyond" + avus "grandfather," from PIE *awo- "adult male relative other than the father" (see uncle).
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