1. Plural of actinian; sea anemones or related marine animals of the order Actiniaria, characterized by a cylindrical body with tentacles around the mouth.
Usage: zoology; technical

Examples

• The tide pool was home to several colorful actinians clinging to the rocks.
• Marine biologists studied the actinians to understand their feeding behavior.
• Actinians are common inhabitants of coral reef ecosystems.
• The aquarium displayed a variety of actinians from different ocean regions.
• These actinians use their tentacles to capture small fish and plankton.