Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

arachnid

play
noun arach·nid \ə-ˈrak-nəd, -ˌnid\

Simple Definition of arachnid

  • : a kind of animal that has eight legs and a body formed of two parts

Source: Merriam-Webster's Learner's Dictionary

Full Definition of arachnid

  1. :  any of a class (Arachnida) of arthropods comprising chiefly terrestrial invertebrates, including the spiders, scorpions, mites, and ticks, and having a segmented body divided into two regions of which the anterior bears four pairs of legs but no antennae

arachnid

adjective

Examples of arachnid in a sentence

  1. Spiders, scorpions, mites, and ticks are arachnids.



Did You Know?

The term arachnid refers to a class of animals that includes spiders, scorpions, mites, and ticks. Most arachnids have a segmented body divided into two regions, with the front part bearing four pairs of legs, but no antennae. They have a hard external skeleton and range in size from the mite, which is 0.003-in (0.08-mm) long, to the 8-in (21-cm) black scorpion of Africa. As arachnids grow, they molt, or shed their skin, several times. Arachnids are primarily carnivorous, but most are unable to digest food internally, instead they inject their prey with digestive fluids, then suck the liquefied remains. Arachnids are found worldwide in nearly every habitat. Some mites and ticks are parasitic and can carry diseases. Venomous spiders and scorpions also may pose a danger to humans, but most arachnids are harmless and prey only on insects.

1826

First Known Use of arachnid

1826


Learn More about arachnid


Seen and Heard

What made you want to look up arachnid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

different from the usual or normal

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

alphabet-pasta-spelling-help

Which is the correct spelling?

accommodate accomodate acommadate acommodate
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ