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A small irregular knot.
References in periodicals archive ?
Tangleweed has a slender, horny stem that is brown to olive green in color and divided into numerous fingers.
The Sea-Tree stood in a world of other sea-growth, from the vast tracts of bladderwrack to the sea-tangles, tangleweeds, oarweeds, seagirdles, horsetail kelps, devil's aprons and mermaid's wineglasses.