1. (a.) Properly, belonging to an order of alga: (Fucoideae) which are blackish in color, and produce oospores which are not fertilized until they have escaped from the conceptacle. The common rockweeds and the gulfweed (Sargassum) are fucoid in character.

2. (a.) In a vague sense, resembling seaweeds, or of the nature of seaweeds.

3. (n.) A plant, whether recent or fossil, which resembles a seaweed. See Fucoid.

Ectocarpales Iceland moss Irish moss Phaeophyceae autophyte bean bracken brown algae climber conferva confervoid creeper diatom dulse fern fruits and vegetables fucoid fucus fungi fungus grapevine green algae gulfweed herb heterophyte ivy kelp legume lentil liana lichen liverwort mold molds moss mushroom parasite parasitic plant pea perthophyte phytoplankton plankton planktonic algae plant families pond scum puffball pulse red algae reindeer moss rockweed rust saprophyte sargasso sargassum scum sea lentil sea moss sea wrack seaweed smut succulent thallogens toadstool vetch vine wort wrack