An instrument or device that makes two copies of writing simultaneously, like a carbon-copy machine.
From Greek 'diplos' (double) + 'graphein' (to write). This term appeared in the 19th century as technology developed for duplicate document creation before modern photocopiers.
Before computers and printers, people used diplographs to create exact duplicate documents at the same time—it's the ancestor of all your copy-and-paste shortcuts today.
Complete word intelligence in one call. Free tier — 50 lookups/day.