Made up of or composed of many parts; composite in nature.
From Latin 'compositus' (composed, put together) plus -ous suffix, which creates adjectives meaning 'full of' or 'characterized by'. A Latinate form of 'composite.'
This is an archaic or rare scholarly variant that you'll occasionally find in old botanical or anatomical texts describing structures with many interconnected parts—it's the kind of word that makes you sound like you're reading from a Victorian encyclopedia.
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