flexitarian
Pronunciation: /ˌfleksəˈte(ə)rēən
noun
A person who has a primarily vegetarian diet but occasionally eats meat or fish: in my close social circle I have a vegetarian, a pescatarian, and a flexitarian [as modifier]: a flexitarian diet
Origin
1990s: blend of flexible and vegetarian.
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A flexitarian might be the direct descendent of any hunter-gatherer culture. Eat what you can get, when you get it. Of course, I've always thought of that as "omnivore."