The popularity of Tolkien's books has had a small but lasting effect on the use of language in fantasy literature in particular, and even on mainstream dictionaries, which today commonly accept Tolkien's idiosyncratic spellings "dwarves" and "dwarvish" (alongside "dwarfs" and "dwarfish"), which had been little used since the mid-19th century and earlier. (In fact, according to Tolkien, had the Old English plural survived, it would have been "dwarrows" or "dwerrows".) He also coined the term "eucatastrophe", though it remains mainly used in connection with his own work.