Relating to or having the quality of being turned or oriented in an opposite direction.
From anti- (opposite) + -tropic (from Greek tropos, turn). This botanical and biological adjective describes the directional opposition of structures or organisms.
The term antitropic connects to heliotropism—while sunflowers are heliotropic (turning toward the sun), some deep-sea creatures are antitropic, evolved to turn away from light in the darkness of the ocean.
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