What is "arachnology"

Arachnology \Ar`ach*nol"o*gy\, n. [Gr. ? spider + -logy.] The department of zo["o]logy which treats of spiders and other Arachnida.

n. The study of the Arachnida

Arachnology is the scientific study of spiders and related animals such as scorpions, pseudoscorpions, and harvestmen, collectively called arachnids. Those who study spiders and other arachnids are arachnologists.

The word arachnology derives from Greek , arachnē, "spider"; and , -logia.