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“Rahab” was the name of a mythological sea serpent or dragon, literally the “boisterous one,” referred to a number of times in the Old Testament (Psalms 87:4; 89:10; Job 9:13; 26:12; Isaiah 30:7, 51:9). The name of this monster has not hitherto been discovered in any extrabiblical text. In the Old Testament, Rahab functions similarly to Leviathan, an originally Canaanite chaos monster, but whether these are to be identified or are separate monsters in origin is not entirely clear.
Rahab m.n. (Hebrew: רַהַב, Modern Rahav, Tiberian Rahaḇ; “blusterer” is used in the Hebrew Bible to indicate rage, fierceness, insolence, pride.) Rahab is the emblematic name of Egypt and is also spoken of with the sea. In medieval Jewish folklore, Rahab is a mythical sea monster.