Words' meanings may also change in terms of the breadth of their semantic domain. Narrowing a word limits its alternative meanings, whereas broadening associates new meanings with it. For example, "hound" (Old English "hund") once referred to any dog, whereas in modern English it denotes only a particular type of dog. On the other hand, the word "dog" itself has been broadened from its Old English root 'dogge', the name of a particular breed, to become the general term for all domestic canines.