Near or toward the median plane or midline, especially in anatomy and zoology.
From ad- (toward) + median (middle). Variant of admedial with the same Latin roots. Both terms emerged in scientific language during the 17th-18th centuries as anatomists needed systematic directional vocabulary.
In insects and fish, scientists describe features as 'admedian' to show they're near the center line of the creature—it's amazing how nature often builds symmetrically around a central axis, which is why biologists needed these exact terms.
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