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Easton's Bible Dictionary
In Exodus 2:3,5 , Isaiah 19:6 , it is the rendering of the Hebrew Suph_, a word which occurs frequently in connection with _yam; As Yam suph , To denote the "Red Sea" (q.v.) or the sea of weeds (as this word is rendered, Jonah 2:5 ). It denotes some kind of sedge or reed which grows in marshy places. (See PAPER, REED .)
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain.
Easton, Matthew George. Entry for 'Flag'. Easton's Bible Dictionary. https://www.studylight.org/dictionaries/eng/ebd/f/flag.html. 1897.