1. (n.) The calcined ashes of seaweed, -- formerly much used in the manufacture of glass, now used in the manufacture of iodine.

2. (n.) Any large blackish seaweed.

algae autophyte bean bracken brown algae climber conferva confervoid creeper diatom fern fruits and vegetables fucus fungus grapevine green algae gulfweed herb heterophyte ivy legume lentil liana lichen liverwort mold moss mushroom parasite parasitic plant pea perthophyte phytoplankton planktonic algae plant families puffball pulse red algae rockweed rust saprophyte sargasso sargassum sea lentil sea moss sea wrack seaweed smut succulent toadstool vetch vine wort wrack