In a manner relating to or directed toward the apex or tip; at or toward the pointed end of a structure.
From 'apical' with the '-ly' adverbial suffix. It describes how something occurs relative to the apex or tip of a structure.
When botanists describe how plant cells grow 'apically,' they're describing one of life's most fundamental processes—cells at the very tip of roots and shoots dividing continuously, pushing plants toward light and water with almost invisible force.
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