invertebrate animal: an invertebrate animal that has jointed limbs, a segmented body, and an exoskeleton made of chitin, e.g. an insect, arachnid, centipede, or crustacean. Phylum Arthropoda.
[Late 19th century. < modern Latin Arthropoda< Greek arthron "joint" (see arthro-) + pod- "foot" (see -pod)]
