Webster's English Dictionary

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decapod

deca.pod \'dek-*-.pa:d\ \di-'kap-*d-*l\ \-*d-*n\ \-*d-*s\ n [NL Decapoda, 
   order name] 1: any of an order (Decapoda) of highly organized crustaceans 
   (as shrimps,  lobsters, crabs) with five pairs of thoracic appendages one 
   or more of which are modified into pincers, stalked eyes, and the head and 
   thorax fused into a cephalothorax and covered by a carapace 2: any of an 
   order (Decapoda) of cephalopod mollusks including the cuttlefi shes, 
   squids, and related forms that have 10 arms - decapod aj