lusus naturae /ˈluːsəs nəˈtjʊəɹiː/ noun2 •An organism exhibiting marked such deviation from the norm, seeming to be the result of sportive design; a freak of nature.I was a lusus naturae, she affirmed, as a village-schoolmistress: she was sure my previous history, if known, would make a delightful romance. — 1847 •(historical) A sportive quality in Nature to which abnormal forms were formerly ascribed; a supposed capricious act of Nature regarded as the cause and origin of anomalies in a given organism.[…]I have observ'd some meshes to have 5, 6, 7, 8, or 9. sides, and some to have onely one, so exceeding various is the Lusus Naturae in this body. — 1665
