ˈkōdēəm noun
Usage: capitalized
Etymology: New Latin, from Greek kōidion fleece, diminutive of kōas; from the fleecy thallus; perhaps akin to Latin cutis skin — more at hide
: a genus (the type of the family Codiaceae) of green algae having a tubular thallus made up of interwoven threads that often end in club-shaped cells and often branching or forming spherical or cushion-shaped masses