any wingless, carnivorous arthropod of the class Arachnida, including spiders, scorpions, mites, ticks, and daddy-longlegs, having a body divided into two parts, the cephalothorax and the abdomen, and having eight appendages and no antennae.: Compare insect.
belonging or pertaining to the arachnids.
- a·rach·ni·dan [uh-rak-ni-duhn], /əˈræk nɪ dən/, adjective, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use arachnid in a sentence
The scorpion, a Heterometrus spinifer, is completely edible, despite the arachnid being deadly if alive.
The arachnid are followed by the myriapoda (centipedes, etc.), and these by the insecti or true insects.
His comparison of the arachnid appendages with those of insects and Crustacea is very curious.Form and Function | E. S. (Edward Stuart) Russell
Patten considers the Pteraspids as derived from primitive arachnid or spider-like forms having a bony carapace as Limulus has.A Guide to the Study of Fishes, Volume 1 (of 2) | David Starr Jordan
The characteristics of the median eyes must then be especially sought for in the arachnid group.The Origin of Vertebrates | Walter Holbrook Gaskell
He simply, therefore, substituted arachnid for Annelid in the old theory.The Origin of Vertebrates | Walter Holbrook Gaskell
British Dictionary definitions for arachnid
any terrestrial chelicerate arthropod of the class Arachnida, characterized by simple eyes and four pairs of legs. The group includes the spiders, scorpions, ticks, mites, and harvestmen
- arachnidan, adjective, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for arachnid
Any of various arthropods of the class Arachnida, such as spiders, scorpions, mites, and ticks. Arthropods are characterized by four pairs of segmented legs and a body that is divided into two regions, the cephalothorax and the abdomen.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.