In anatomy, in the direction of the back or dorsal surface; toward the back.
From Latin 'dorsum' (back) combined with '-ad' (suffix meaning 'toward'), literally meaning 'toward the back,' following the Latin directional pattern.
The '-ad' suffix is pure anatomical efficiency—'cephalad' (toward the head), 'caudad' (toward the tail), 'dorsad' (toward the back)—it's like a coordinate system written into word structure.
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