A group of four connected things, especially the four parts of a symmetrical structure in biology.
From Greek 'artios' (even, complete) + '-ad' (a group or set). A biological term describing symmetrical groupings.
Most animals have four limbs arranged symmetrically—this obscure term tries to capture that fundamental pattern, but it never caught on because biologists preferred 'tetrapod' (literally 'four-foot'), which is more obvious.
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