adverb
in a direction from the base towards the apex
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The nutrients in the plant are transported acropetally from the roots to the leaves.
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The water moves acropetally through the plant, starting from the bottom and going up.
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The plant sucks up water acropetally, like a straw in a drink.
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Ideas in the organization are communicated acropetally, starting from the top management down to the lower levels.