Turning or growing toward the cause of a stimulus, particularly in biological responses where an organism moves toward the agent that stimulates it.
From Greek 'aitia' (cause) and 'tropos' (turning), combined with the prefix 'aiti-'. This scientific term emerged in 19th-century biology to describe directional growth responses in organisms.
Plants don't just grow toward light randomly—they actually respond to the *cause* of stimulation through chemical signals, which is why the term 'aitiotropic' captures something more specific than just 'phototrophic': it's about sensing what *caused* the stimulus, not just reacting to it.
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