Euphemism, is in speech or writing the avoiding of an unpleasant or indelicate word or expression by the use of one which is less direct, and which calls up a less disagreeable image in the mind. Thus for “he died” is substituted “he fell asleep,” or “he is gathered to his fathers”; thus the Greeks called the “Furies” the “Eumenides,” “the benign goddesses,” just as country people used to call elves and fairies “the good folk neighbours.”
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Eupatoria * Euphrates