Inventor David Aguilar built a fully functional prosthetic one from Legos (3)

I believe the answer is:

arm

(Other definitions for arm that I've seen before include "Test of strength with elbows on the table" , "Equip with a limb" , "Limb or branch" , "strip of land?" , "Ram into limb" .)

I've seen this clue in The New York Times.

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