Of, relating to, or resembling sand; sandy or gritty in nature or texture.
From Latin 'arenarius' (sandy, of sand), an adjective form derived from 'arena' (sand), with English suffix '-ous' added for emphasis.
This is an older, more elaborate way to say 'sandy'—the kind of word that might appear in 18th-century geological or botanical texts when scientists loved adding extra syllables!
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