from pion, "fat," from a root, pi---, signifying "swelling," is used metaphorically in Romans 11:17 . The gentile believer had become a sharer in the spiritual life and blessing bestowed by Divine covenant upon Abraham and his descendants as set forth under the figure of "the root of (not 'and') the fatness of the olive tree."
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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