The condition or quality of having jointed feet or limbs; the structural characteristic of possessing articulated appendages.
From arthro- (jointed) + -pody (from Greek pous, foot, + -ia, condition). This noun form allows discussion of the anatomical feature as an abstract quality or characteristic.
Arthropody—having jointed limbs—seems like a simple thing, but it was the evolutionary innovation that allowed animals to dominate land; rigid legs don't bend, but jointed ones let creatures run, climb, and adapt to any terrain.
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