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Red Sea

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noun
  1. an arm of the Indian Ocean, extending NW between Africa and Arabia: connected to the Mediterranean by the Suez Canal. 1450 miles (2335 km) long; 170,000 sq. mi. (440,300 sq. km); greatest depth, 7254 feet (2211 meters).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for red sea

Red Sea

noun
  1. a long narrow sea between Arabia and NE Africa, linked with the Mediterranean in the north by the Suez Canal and with the Indian Ocean in the south: occasionally reddish in appearance through algae. Area: 438 000 sq km (169 000 sq miles)
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for red sea

Red Sea

n.

the Greek thalassa erythra; the reason for the name is unknown; speculation has traced it to: 1. algae in coastal waters; 2. sandstone rock formations on the shores; 3. a tribal name; 4. ancient association of "red" with "south" (as "black" with "north").

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Online Etymology Dictionary, © 2010 Douglas Harper

red sea in Culture

Red Sea

Narrow sea between Africa and the Arabian Peninsula.

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Note

Probably named for the red algae that are sometimes present in its waters.

Note

According to the Bible (see also Bible), the Red Sea's waters parted to allow the Israelites, led by Moses, to escape the pursuing Egyptian army. The “Red Sea” of the biblical account, however, seems more likely to have been the marshy Sea of Reeds than the present-day Red Sea.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.