Of, relating to, or resembling spiders; characteristic of spiders or their behavior.
From 'aranea' (spider) plus the adjective suffix '-ous,' used commonly in English to form adjectives from nouns. This creates an alternative adjectival form to 'arachnoid' or 'araneid.'
The '-ous' suffix is one of the most productive adjective-making tools in English—we use it to turn 'danger' into 'dangerous,' 'poison' into 'poisonous,' so 'araneous' follows a pattern we use thousands of times daily!
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