Home › Words › R › rockweedrockweedrockweed means ascophyllum nodosum, a seaweed also known as knotted wrack.Among words judged in Lexicurio's Arena, rockweed ranks #29,100 of 42,747 for Qualifying.EtymologyFrom rock + weed.nounAscophyllum nodosum, a seaweed also known as knotted wrack.Fucus vesiculosus, a similar seaweed also known as bladderwrack.Definitions & examples from Wiktionary (CC BY-SA 3.0).Words closest in meaningBy meaning, not spelling — each word's AI semantic fingerprint, nearest first.seawrack 67% match — Masses of seaweed washed ashore and in piles along a shore, predominantly algae of family Fucaceae. vs rockweed →beanweed 65% match — Scytosiphon lomentaria, a littoral brown filamentous seaweed. vs rockweed →henware 65% match — A seaweed, badderlocks. vs rockweed →bubbleweed 63% match — Any of the seaweeds of the genus Hormosira. vs rockweed →eelwrack 63% match — eelgrass (Zostera species) vs rockweed →bellware 61% match — Synonym of seawrack. vs rockweed →mekabu 61% match — Undaria pinnatifida, a sea plant native to Japan and Korea and invasive elsewhere; wakame; Asian kelp. vs rockweed →tidewrack 60% match — Seaweed and similar marine vegetation and rubbish deposited along a shore by a receding tide. vs rockweed →