1. Plural of echinus; sea urchins, especially those of the genus Echinus.
Usage: zoology; plural form
2. In architecture, a molding with a rounded convex profile, typically found at the top of a column capital.
Usage: architecture; plural form

Examples

• The marine biologist studied the echini collected from the rocky tide pools.
• Several echini were visible clinging to the rocks beneath the water's surface.
• The Doric column's capital featured decorative echini moldings.
• Ancient Greek architects incorporated echini into their classical designs.
• The echini in the aquarium slowly moved across the tank floor.