sea thong

noun

Definition of sea thong 

1 : a brown seaweed (Himanthalia lorea) found on the northern coasts of the Atlantic and having a long slender thallus that rises from a top-shaped holdfast

2 : any of several seaweeds having corded fronds: such as

a : a sea lace (Chorda filum)

b : a member of the genus Laminaria

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