In the other thread about delirium (which closed before it matures, I think) a fellow posted from OED that it comes from " L. delirium "madness," from deliriare "be crazy, rave," lit. "go off the furrow," a plowing metaphor, from phrase de lire, from de "off, away" + lira "furrow, earth thrown up between two furrows," from PIE *leis- "track, furrow." But the word seems to be the latinized Gr. para-lerema (with the same meaning) found in Plato, Aristoteles and many other classical texts. http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.04.0057:entry=paralhre/w This para- corresponds to the L. de- as in para-morphosis > de-formation. The origin is the v. ληρέω (to be foolish or silly, speak or act foolishly), found in Sophocles (497-406 BC), in Trachiniae which is considered one of his early works. http://www.perseus.tufts.edu/hopper...habetic+letter=*l:entry+group=31:entry=lhre/w Thus, unless we have an evidence that by Sophocles' time this word was a loan from Latin (most unlikely), I suppose OED is wrong. What do you thing about it?