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any member of the class arachnida.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks, characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen.
a·rach′ni·dan (-nĭ-dən) adj. & n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
arachnidadjective Referring to a member of the class Arachnida (e.g., spiders).
noun A member of the class Arachnida (e.g., spiders).
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
arachnidAny of the eight-legged arthropods of the class Arachnida , including spiders, scorpions, mites, and ticks. From the Greek arachne , a spider.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005
arachnoidany member of the class Arachnida in the phylum Arthropoda. The class contains scorpions, spiders, harvestmen, ticks, mites and king crabs. They lack antennae, usually possess four pairs of walking legs, and, excepting Limulus (king crab), are air-breathing.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
Large class of arthropods that includes spiders, scorpions, mites, and ticks. Arachnids have a segmented body divided into two parts, one of which has four pairs of legs but no antennae.
Mentioned in: Bites and Stings
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.