FUCOID
fucoid, fucoid algae
(noun) any of various algae of the family Fucaceae
fucoid
(noun) a fossilized cast or impression of algae of the order Fucales
Source: WordNet® 3.1
Etymology
Adjective
fucoid (comparative more fucoid, superlative most fucoid)
Resembling or relating to seaweeds of the genus Fucus.
Of sandstone: bearing seaweed-like markings.
• Calcareous siltstone, Cambrian Fucoid Beds, earth.ox.ac.uk webpage
Noun
fucoid (plural fucoids)
A fucoid seaweed.
Source: Wiktionary
Fu"coid, a. Etym: [Fucus + -oid.] (Bot.)
(a) 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.
(b) In a vague sense, resembling seaweeds, or of the nature of
seaweeds.
Fu"coid, n. (Bot.)
Definition: A plant, whether recent or fossil, which resembles a seaweed.
See Fucoid, a.
Source: Webster’s Unabridged Dictionary 1913 Edition