sea star
Definition
- Noun:
- A marine echinoderm animal: A "sea star" is an invertebrate sea animal, typically characterized by a central disc body from which five or more radiating arms extend. It is also commonly called a "starfish."
Examples of Usage
- Noun:
- We saw a bright orange sea star clinging to the rock at low tide.
- The biology student carefully studied the anatomy of the sea star.
- Sea stars are important predators in many ocean ecosystems.
Advanced Usage
- "Sea star wasting disease": Refers to a condition that causes sea stars to develop lesions, lose their arms, and disintegrate.
- Researchers are monitoring the spread of sea star wasting disease along the coast.
Variants and Related Words
- Starfish (n): The common, informal name for a sea star. While widely used, scientists often prefer "sea star" as these animals are not fish.
- Children love to find starfish in tidal pools.
Synonyms
- Asteroid (n): The scientific name for the class Asteroidea, which includes sea stars.
- Echinoderm (n): The broader phylum (Echinodermata) to which sea stars belong, also including sea urchins and sand dollars.
Related Phrases
- Sea star arm/ray: Refers to one of the typically five extensions from the central disc of a sea star.
- The sea star can regenerate a lost arm.
Related Idioms
Noun
-
echinoderms characterized by five arms extending from a central disk
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