noun \ˈär-thrə-ˌpäd\

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
arthropod adjective
ar·throp·o·dan \är-ˈthrä-pə-dən\ adjective


New Latin Arthropoda, from arthr- + Greek pod-, pous foot — more at foot
First Known Use: 1876


noun    (Concise Encyclopedia)

Representative arthropods. Uniramia, the largest of the arthropod subphyla, contains mostly …—© Merriam-Webster Inc.

Any member of the largest phylum, Arthropoda, in the animal kingdom. Arthropoda consists of more than one million known invertebrate species in four subphyla: Uniramia (five classes, including insects), Chelicerata (three classes, including arachnids and horseshoe crabs), Crustacea (crustaceans), and Trilobita (trilobites). All arthropods are bilaterally symmetrical and possess a segmented body covered by an exoskeleton containing chitin, which serves as both armour and a surface for muscle attachment. Each body segment may bear a pair of jointed appendages. The phylum includes carnivores, herbivores, omnivores, detritus feeders, filter feeders, and parasites (see parasitism) in nearly all environments, both aquatic and terrestrial.


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