puris naturalibus
/ˌpjʊəriːs ˌnatʃəˈrɑːlɪbəs/ /ˌpjɔːriːs ˌnatʃəˈrɑːlɪbəs/Now rare
adverb
In a pure or natural state; naked.
Origin
Early 17th century; earliest use found in William Vaughan (c1575–1641), writer and promoter of colonization in Newfoundland. Shortened from in.