Webster's English Dictionary

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arthropod

ar.thro.pod or ar.throp.o.dan or ar.throp.o.dous \'a:r-thr*-.pa:d\ 
   \a:r-'thra:p-*d-*l\ \-*d-*n\ \-*d-*s\ n [NL Arthropoda, fr. arthr- + -poda] 
   : any of a phylum (Arthropoda) of invertebrate animals with articulate body
   and limbs (as insects, arachnids, and crustaceans) - arthropod aj