Arachnoid
//əˈɹæk.nɔɪd// adj, noun
adj, noun ·Uncommon ·Advanced level
Definitions
Noun
- 1 Ellipsis of arachnoid mater. abbreviation, alt-of, ellipsis
- 2 An arachnid.
- 3 air-breathing arthropods characterized by simple eyes and four pairs of legs wordnet
- 4 A round network of fractures in the crust of Venus.
- 5 the middle of the 3 meninges wordnet
Adjective
- 1 Relating to or resembling spider webs; covered with or composed of soft loose hairs or fibers. not-comparable
- 2 Relating to or resembling spiders. not-comparable, relational
- 3 Relating to the arachnoid mater. not-comparable
Adjective
- 1 relating to or resembling a member of the class Arachnida wordnet
Etymology
Etymology 1
Mid 18th century borrowing from New Latin arachnoīdēs, from Ancient Greek ᾰ̓ρᾰχνοειδής (ărăkhnoeidḗs, “like a cobweb”), from ᾰ̓ρᾰ́χνη (ărắkhnē, “spider web”) + -ο- (-o-) + -ειδής (-eidḗs, “-oid, -like”). By surface analysis, arachn- + -oid.
Etymology 2
19th century from translingual Arachnida + -oid.
Related phrases
More for "arachnoid"
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.