"a raven" (perhaps onomatopoeic, representing the sound), occurs in the plural in Luke 12:24 . The Heb. oreb and the Arabic ghurab are from roots meaning "to be black;" the Arabic root also has the idea of leaving home. Hence the evil omen attached to the bird. It is the first bird mentioned in the Bible, Genesis 8:7 . Christ used the "ravens" to illustrate and enforce the lesson of God's provision and care.
With over 3,400 entries, this timeless classic is THE reference guide to New Testament Greek words for English readers. It explains the meaning of the original Greek with the added dimension of the context of the Greek word.Wikipedia
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