Of, relating to, or belonging to the Atropa genus or the nightshade family Solanaceae.
From 'Atropa' (the plant genus) + '-aceous' (a suffix meaning belonging to or of the nature of). This botanical classification term developed in Linnaean taxonomy to group plants by family characteristics.
Botanists use '-aceous' to create family names (like Rosaceae for roses), so 'atropaceous' is their formal way of saying 'it belongs to the Atropa crowd of deadly nightshades!'
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