Angel - The English word comes from the Greek "angelos" (messenger). In the Bible they were described as an intelligent and immortal species, usually presented as being visually indistinguishable from humans -- i.e. with a human body and without wings. They delivered messages from God, and either harmed or helped humans. Satan is described in the Bible as an evil angel. Because the Bible's cosmology asserts that the earth was flat, that it was covered by a metal firmament or dome, and that God resided in Heaven above the dome, angels have often been portrayed as having wings so that they could fly from Heaven to earth and back.

In various human mythologies an angel is believed to be an ethereal creature whose duties are to assist and serve the God or gods of many religious traditions. The word originated from the Latin angelus, itself derived from the Greek, ángelos, meaning “messenger”. The closest Hebrew word for angel is, mal'ach , also meaning messenger. (wikipedia)