In anatomy or zoology, directed toward or situated at the base of a structure.
From Latin 'basis' (base) plus '-ad' (toward), following medical and anatomical terminology conventions. It's the opposite of 'apical' and appears in scientific descriptions of body parts and organisms.
Anatomists have entire sets of directional words—'basad' means toward the base, 'apical' means toward the tip, 'proximal' means toward the trunk. They're so useful that surgeons and biologists use them constantly without thinking about how specific they are!
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