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The Collaborative International Dictionary
seaware

Sea girdles \Sea" gir"dles\ (Bot.) A kind of kelp ( Laminaria digitata) with palmately cleft fronds; -- called also sea wand, seaware, and tangle.

Wiktionary
seaware

n. 1 (context archaic English) flotsam; articles cast up by the sea. 2 A kind of kelp; sea girdles.