Relating to or describing movements made by plants in response to both gravity and darkness or nighttime conditions.
From Greek 'geo-' (earth), 'nyx' (night), and 'nastos' (pressed), combined with '-ic' suffix. This botanical term emerged in 19th-century plant physiology research.
Plants execute these movements through growth rate changes on different sides of their stems—it's like they're 'bending down' at night while 'reaching up' in daylight, a circadian dance choreographed by gravity and darkness.
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