Moving toward the back and toward the rear or tail end of the body at the same time.
From Latin 'dorsum' (back) + 'posterior' (rear, farther back) + '-ad' (directional suffix meaning 'toward'). Used in anatomical movement descriptions.
In biology labs, when scientists describe how something moves or develops 'dorsoposteriad,' they're using the same efficient coordinate system that GPS uses for directions.
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