sargasso

noun
sar·​gas·​so | \sär-ˈga-(ˌ)sō \
plural sargassos

Definition of sargasso 

2 : a mass of floating vegetation and especially sargassums

First Known Use of sargasso

1598, in the meaning defined at sense 1

History and Etymology for sargasso

borrowed from Portuguese sargaço, apparently the same word as sargaço, sargaça "the flowering plant Halimium lasianthum, related to the rockrose," of uncertain origin

Note: Traced by Coromines (Diccionario crítico etimológico castellano e hispánico) along with Spanish jaguarzo to a putative Mozarabic *xaugaçro, going back to Latin salicastrum, a plant of uncertain identity named by Pliny.

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The first known use of sargasso was in 1598

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