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(Science: zoology) A division of arachnoidea, including the daddy longlegs or harvestman (Phalangium) and many similar kinds. They have long, slender, many-jointed legs; usually a rounded, segmented abdomen; and chelate jaws. They breathe by tracheae.

Synonym: Phalangides, Phalangidea, Phalangiida, and Opilionea.

Origin: NL, from Phalangium the daddy longlegs (see Phalangious) _ Gr. Form.