Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
arachnidian is an adjective meaning "relating to or resembling a member of the class Arachnida". It carries one recorded sense.
relating to or resembling a member of the class Arachnida
zoology
Definitions, synonyms and semantic relations for arachnidian come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.