- arachnid, arachnoid - air-breathing arthropods characterized by simple eyes and four pairs of legs
--1 is a kind of arthropod
--1 is a member of Arachnida, class Arachnida
--1 has particulars:harvestman, daddy longlegs, Phalangium opilio; scorpion; false scorpion, pseudoscorpion; whip-scorpion, whip scorpion; spider; acarine