Smith's Bible Dictionary
Ko'a. (he-camel). Koa is a word which occurs only in Ezekiel 23:23. It may perhaps have been a city or district of Babylonia; or it may be a common noun, signifying "prince" or "nobleman".
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Smith, William, Dr. Entry for 'Koa'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/k/koa.html. 1901.