Properly, belonging to an order of alga: (Fucoideæ) which are blackish in color, and produce oöspores which are not fertilized until they have escaped from the conceptacle. The common rockweeds and the gulfweed (Sargassum) are fucoid in character. [1913 Webster]
, n.
A plant, whether recent or fossil, which resembles a seaweed. See Fucoid, a. [1913 Webster]