Describing organisms or processes that occur within a living organism, especially parasites or microorganisms that live inside a host body.
From Greek 'endo-' (within) + 'bios' (life). This biological term describes life that exists inside other life, reflecting 19th-century naturalists' focus on internal parasites and symbiotic relationships.
Your gut bacteria are endobiotic—they're living their entire lives inside you, and scientists discovered that these internal organisms shape everything from your digestion to your moods.
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