Arachnid (noun)

Any of a class (Arachnida) of arthropods that includes spiders, scorpions, mites, and ticks and that have four pairs of legs but no antennae.

Origin:

From the greek word "aráchnē", meaning spider.

Examples:

1. The arachnid crawled across the web.
2. He found a black widow arachnid in his garage.
3. The arachnid family is very diverse.
4. The arachnid's venom can be very dangerous.
5. Scientists are studying the arachnid's behavior.