The tendency of a plant to maintain a fixed angle with respect to the sun's rays, orienting itself perpendicular to direct sunlight rather than tracking it.
From Greek 'dia-' (across) + 'helio-' (sun) + 'tropism' (movement toward). This scientific term emerged in botany to distinguish this specific behavior from simple heliotropism.
Diaheliotropism is nature's way of saying 'I like you, sun, but not too much'—it's especially common in desert plants that need to avoid dehydration while still photosynthesizing!
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