I looked this word up in the dictionary for my science PACE and Daddy read the definition with me and he laughed and said that I needed to post this on the blog. So here's this VERY UNDERSTANDABLE definition. (sarcasm)
Definition of ARTHROPOD
: any of a phylum (Arthropoda) of invertebrate animals (as insects, arachnids, and crustaceans) that have a segmented body and jointed appendages, a usually chitinous exoskeleton molted at intervals, and a dorsal anterior brain connected to a ventral chain of ganglia.