Describing plant growth that is parallel to the direction of gravity, rather than directly toward or away from it.
From Greek 'geo-' (earth), 'parallelos' (parallel), and 'tropos' (turning). This highly specialized botanical term emerged in late 19th-century plant biology research.
Plant stems grow this way—parallel to gravity instead of pointing straight up—which maximizes sunlight capture while root stays earthbound, a clever engineering solution millions of years in the making.
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