Definition

Noun: 1. A type of red algae: Any of various marine red algae, typically having delicate, often reddish or purplish, branching fronds. Some species, like dulse and carrageen (Irish moss), are edible or used to produce thickening agents. 2. A type of colonial animal: A sessile aquatic animal (a bryozoan) that forms moss-like, encrusting colonies on surfaces like stones or seaweed. Each colony consists of many tiny, interconnected polyps.

Usage Examples

• Noun (Algae):
  • The beachcomber collected sea moss to use in a traditional soup.
  • Carrageenan, a common food additive, is extracted from certain types of sea moss.
• Noun (Animal):
  • The underside of the dock was covered in a crust of sea moss.
  • Under the microscope, the sea moss colony revealed its intricate structure of individual polyps.

Advanced Usage

• The term is used broadly and can be ambiguous without context, referring to either of two biologically distinct organisms (a plant-like algae or an animal) based on their similar appearance.
• In culinary and commercial contexts, "sea moss" almost always refers to the edible red algae, particularly (Irish moss).

Variants and Related Words

• Irish moss: A specific type of red algae () commonly referred to as sea moss, used for carrageenan.
• Dulse: Another edible red seaweed () sometimes grouped under the general term "sea moss."
• Carrageen: Another name for Irish moss.
• Bryozoan: The scientific name for the animal often called "sea moss" or "moss animal."

Synonyms

• For the algae: red seaweed, marine algae, carrageen, Irish moss.
• For the animal: bryozoan, moss animal, polyzoan.

Notes on Different Meanings

The two primary meanings are distinct: 1. The first refers to a marine plant (algae), important for food and industry. 2. The second refers to a colonial aquatic animal (bryozoan), important in marine ecology as a filter-feeder and part of the fouling community. Context (e.g., cooking, aquaculture, marine biology) usually clarifies which meaning is intended.

Noun

1. any of various red algae having graceful rose to purple fronds (e.g. dulse or carrageen)
2. sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding