In anatomy, a small bony projection opposite or corresponding to the trochanter (a prominence on the thighbone).
From anti- (opposite) + trochanter, from Greek trochanter (runner), from trechein (to run). Used in comparative anatomy to describe corresponding bone features, appearing in 19th-century anatomical texts.
The trochanter is where your thigh muscles attach to give you powerful leg kicks—and when anatomists found similar bumps in other animals, they named them antitrochanters, showing how evolution repurposes the same bone designs across species.
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