Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun A taxonomic subphylum within the phylum Arthropoda — the arachnids, horseshoe crabs, and sea spiders.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun spiders; scorpions; horseshoe crabs

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek χηλή ("jawbone") + κέρας ("horn").

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