Swimming or moving around in a circular motion; able to swim around something.
From Latin circum- (around) + natans (swimming, from natare meaning to swim). Describes creatures or objects capable of moving in circular swimming patterns.
Fish in a circular tank sometimes exhibit circumnatant behavior, repeatedly swimming in loops—scientists study this because it can indicate stress or neurological problems. It's one of those precise biological terms that describes something you've probably observed in aquariums!
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