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The Collaborative International Dictionary
Pyramidically

Pyramidic \Pyr`a*mid"ic\, Pyramidical \Pyr`a*mid"ic*al\, a. Of or pertaining to a pyramid; having the form of a pyramid; pyramidal. `` A pyramidical rock.''
--Goldsmith. ``Gold in pyramidic plenty piled.''
--Shenstone. -- Pyr`a*mid"ic*al*ly, adv. Pyr`a*mild"ic*al*ness, n.

WordNet
pyramidically

adv. in a pyramidal manner or shape; "the bush was trimmed pyramidically"