/ ˈeɪndʒl; NAmE / noun
1.
a spirit who is believed to be a servant of God, and is sent by God to deliver a message or perform a task. Angels are often shown dressed in white, with wings.
—see also guardian angel
2.
a person who is very good and kind; a child who behaves well :
John is no angel , believe me (= he does not behave well) .
3.
( informal ) used when you are talking to sb and you are grateful to them :
Thanks Dad, you're an angel .
Be an angel and make me a cup of coffee.
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WORD ORIGIN
Old English engel , ultimately via ecclesiastical Latin from Greek angelos messenger; superseded in Middle English by forms from Old French angele .