Strong's Hebrew: 4751. mar (mar)
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4751. mar (mar)
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Or (feminine) marah {maw-raw'}; from
marar
; bitter (literally or figuratively); also (as noun) bitterness, or (adverbially) bitterly -- + angry, bitter(-ly, -ness), chafed, discontented, X great, heavy.
see HEBREW
marar
Strong's Numbers Online Bible Dictionary