Plural of epicotyl; the part of a plant seedling between the seed leaves and the first true leaves.
From Greek 'epi-' (upon) + 'kotyledon' (seed leaf) + '-s' (plural). Direct botanical term for seedling anatomy.
If you've ever grown a bean plant from seed and watched it stretch upward, you've watched the epicotyl race toward light—it has growth hormones so sensitive they respond to just a few seconds of uneven sunlight.
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