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[sahr-gas-oh] /sɑrˈgæs oʊ/
noun, plural sargassos.
a gulfweed.
Origin of sargasso
1590-1600; < Portuguese, perhaps special use of sargaço rockrose < Latin salicastrum, equivalent to salic- (stem of salix) willow + -astrum, neuter of -aster -aster1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for sargasso


noun (pl) -sos
another name for gulfweed, sargassum
Word Origin
C16: from Portuguese sargaço, of unknown origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for sargasso

"seaweed," 1590s, from Portuguese sargasso "seaweed," perhaps from sarga, a type of grape (on this theory, the sea plant was so called from its berry-like air sacs), or from Latin sargus, a kind of fish found in the Mediterranean and eastern Atlantic, from Greek sargos. Sargasso Sea attested from 1819.

Online Etymology Dictionary, © 2010 Douglas Harper
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