YMCA [,wī-,em-(,)sē-'ā] -n

  1. an international organization that promotes the spiritual, intellectual, social, and physical welfare orig. of young men

YMHA [,wī-,em-,āch-'ā] -n

  1. an organization that promotes the religious, intellectual, social, and physical welfare of Jewish young men

Ymir ['ē-,mir] -n

  1. a giant from whose body the gods create the world in Norse mythology