IPA: /ˈætəvɪk/
KK: /əˈtævɪk/
Relating to or resembling an ancestor or ancestral traits; often used to describe something that is primitive or instinctual.
His atavic instincts led him to seek shelter in the wilderness.
Atavic is derived from the Latin word "atavus" (meaning ancestor or forefather) and the suffix "-ic" (meaning pertaining to). The term "atavistic" refers to characteristics or traits that are reminiscent of one's ancestors or forebears.
Think of 'ancestor' ('atavus') to remember that 'atavistic' means relating to traits from your forebears.