Definition

1. Noun:
   • A type of coral: "sea fan" refers to a colonial marine animal (a coral) that belongs to the order Gorgonacea (or Alcyonacea). It is characterized by a horny, flexible skeleton that forms a structure resembling a tree or a fan.

Usage

• The term "sea fan" is used specifically in marine biology and ecology to describe these distinctive, often colorful, coral formations.
• It is typically used as a countable noun.

Examples

• Noun:
  • Divers observed a large purple sea fan growing on the reef wall.
  • The aquarium has a beautiful exhibit featuring several different species of sea fan.

Advanced Usage

• Scientific context: In taxonomy, "sea fan" is a common name for corals in families like Gorgoniidae. They are also referred to as gorgonians.
  • The study focused on the growth rates of the sea fan Gorgonia ventalina.

Variants and Related Words

• Gorgonian (n): The scientific/technical term for sea fans and their relatives, referring to the order Gorgonacea.
  • Gorgonians, including sea fans, are important components of coral reef ecosystems.

Synonyms

• Gorgonian: The direct scientific synonym.
• Soft coral: A broader category that includes sea fans, though not all soft corals are fan-shaped.

Notes

• Sea fans are not plants but animals (colonial cnidarians). They filter feed on plankton from the water.
• Their structure is composed of a protein called gorgonin, which gives the skeleton its horny, flexible quality.

Noun

1. corals having a treelike or fan-shaped horny skeleton