Boyd’s Bible Dictionary:
(bitter). The desert spring whose waters were sweetened (Ex. 15:22-25; Num. 33:8-9).
Concise Bible Dictionary:
One of the early stations of the Israelites, so called because the waters there were bitter, but which were made sweet by casting in a tree (Ex. 15:23; Num. 33:8-9). It is typical of the Christian’s acceptance of death (Rom. 6:11; John 6:53, and more), in order to live unto God. It is the love of Christ, expressed in His going into death to make a way out for us, that sweetens the bitterness.
Strong’s Dictionary of Hebrew Words:
Meaning:
the same as 4751 feminine; bitter; Marah, a place in the Desert
Jackson’s Dictionary of Scripture Proper Names:
he rebelled: bitterness
Potts’ Bible Proper Names:
Bitterness; calamity:―desert spring whose waters were sweetened, Exod. 15:23. {Amaritudo}