Vine's Expository Dictionary of NT Words
a feminine form of prostates, denotes "a protectress, patroness;" it is used metaphorically of Phoebe in Romans 16:2 . It is a word of dignity, evidently chosen instead of others which might have been used (see, e.g., under HELPER), and indicates the high esteem with which she was regarded, as one who had been a protectress of many. Prostates was the title of a citizen in Athens, who had the responsibility of seeing to the welfare of resident aliens who were without civic rights. Among the Jews it signified a wealthy patron of the community.
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Vines, W. E., M. A. Entry for 'Succorer'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/s/succorer.html. 1940.