1. A bioluminescent marine dinoflagellate (genus Noctiluca) that produces light in seawater, often visible as glowing waves or sparkles at night.
Usage: scientific; biology; often used in plural form 'noctilucae' or as a mass noun

Examples

• The noctiluca in the bay created a magical blue glow when the waves crashed at night.
• Swimmers were amazed by the bioluminescent display caused by noctiluca blooms.
• Noctiluca scintillans is one of the most common species responsible for red tides.
• The noctiluca population increased dramatically after heavy rainfall.
• Researchers study noctiluca to understand marine bioluminescence.