| obligate |
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adjective
- (biology) Able to exist or survive only in a particular environment or by assuming a particular role: an obligate parasite; an obligate anaerobe.
- Absolutely indispensable; essential.
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| oligotrophic |
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adjective
- (context, of a diet) being deficient in nutrition
- (context, of a lake or an ocean etc) being deficient in plant nutrients, such as nitrogen or phosphorus
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| oligotrophy |
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noun
- the condition of being oligotrophic
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| omnivore |
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noun
- An animal which is able to consume both plants (like a herbivore) and meat (like a carnivore).
- Bears are omnivores, they can eat plants but they enjoy eating fish.
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| omnivorous |
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adjective
- having the ability to eat both animal and vegetable food
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| omophagia |
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noun
- the eating of raw food, especially raw flesh
- 1936: Omophagia, that"s it! Do you like that word? Take it away with you! " Henry Miller, Black Spring
- 1992: Uncomfortably, I thought of the Bacchae: hooves and bloody ribs, scraps dangling from the fir trees. There was a word for it in Greek: . " Donna Tartt, The Secret History
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