a person born with a severe malformation, with four hands. [ < scientific Latin tetrachirus (1831 or earlier) < Hellenistic Greek τετράχειρ four-handed < ancient Greek τετρα-tetra-comb. form + χείρ hand (see cheiro-comb. form).]
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1890 J. S. BillingsNational Med. Dict. II. 659/2Tetrachirus, a monster with four hands.