Home › Words › O › oarweedoarweedoarweed · noun — A brown alga, Laminaria digitata, found on exposed shores.Definition from Wiktionary (CC BY-SA 3.0).EtymologyFrom oar + weed.nounA brown alga, Laminaria digitata, found on exposed shores.Definitions & examples from Wiktionary (CC BY-SA 3.0).