adj · noun · 2 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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/ˌsʌb.əˈɹæk.nɔɪd/
rhymes with -æknɔɪd
1
adj
Meaning 1
Located or occurring below the arachnoid mater, often specifically between the arachnoid membrane and the pia mater.
Definition source: English Wiktionary via Wiktextract
Usage: not-comparable, relational
Topics: anatomy, medicine, sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: subarachnoidal
Antonyms: none provided
2
noun
Meaning 2
Ellipsis of subarachnoid space.
Definition source: English Wiktionary via Wiktextract
Usage: abbreviation, alt-of, ellipsis
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
History
Etymology
Etymology tree Proto-Indo-European *upó Proto-Italic *supo Latin sub Latin sub-der. English sub- English arachnoid English subarachnoid From sub- + arachnoid.
Across languages
Translations
5 source translations are retained for this English entry.
Chinese Mandarin:
蛛網膜下 /蛛网膜下
(zhūwǎngmóxià)
— below the arachnoid mater
Czech:
subarachnoidální
— below the arachnoid mater
Finnish:
lukinkalvonalainen
— below the arachnoid mater
Polish:
podpajęczynówkowy
— below the arachnoid mater
Spanish:
subaracnoideo
— below the arachnoid mater