A biological relationship in which two organisms directly oppose or harm each other's existence, essentially the opposite of symbiosis.
From Greek 'enantios' (opposite) + 'biosis' (from 'bios' meaning life). This scientific term was coined to describe antagonistic relationships between organisms, mirroring the structure of 'symbiosis' but with the opposite meaning.
While symbiosis gets all the fame, enantiobiosis describes equally important ecological relationships—like when a parasite and host fight, or predator and prey battle for survival. It's nature's competition made official.
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