Standard Lemma guide

subarachnoid

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

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /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