Prose is the form of written language that follows the natural flow of speech, a language's ordinary grammatical structures, or typical writing conventions and formatting. Thus, prose includes academic writing and differs most notably from poetry, where the format consists of verse: writing formatted in lines, which traditionally follow rhythmic metre or a rhyme scheme. The word "prose" first appeared in English in the 14th century. It is derived from the Old French prose, which in turn originates in the Latin expression prosa oratio.