The same as mar feminine; bitter; Marah, a place in the Desert -- Marah.
see HEBREW mar
H4785. Marah
מָרָה proper name, feminine of bitter spring in Sinaitic peninsula Exodus 15:23 (twice in verse) (J), Numbers 33:8-9, (P), + ה locative מָרָ֑תָה Exodus 15:23 (J); probably modern `Ain Hawwâraiun. (compare RobBR i. 67) PalmerDesert i. 40 EbGS 125 f.)