Arthropoda \Ar*throp"o*da\, n. pl. [NL., fr. Gr. 'a`rqron joint + -poda.]

(Zo["o]l.) A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea. -- Ar*throp"o*dal, a.

Source: Webster's Revised Unabridged Dictionary (1913)