seagrass - definition and synonyms

noun 

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/ˈsiːˌɡrɑːs/
singularseagrass
pluralseagrasses
  1. 1
    [countable/uncountable] a type of plant with very long roots that live under the sea, usually in water that is not very deep
  2. 2
    [uncountable] a type of carpet made from seagrass