noctiluca
- A genus of large, spherical, bioluminescent marine dinoflagellates that produce the glowing blue-green light visible in disturbed seawater at night; also used more generally to refer to any such light-producing sea organism.
- Historically and poetically, any object or phenomenon that shines or glows in the dark, including certain phosphorescent substances.
In a sentence
- The kayakers paddled in silence as each stroke ignited blooms of noctiluca, turning the dark water electric blue.
- Marine biologists studying the bloom found that noctiluca was responsible for the brilliant bioluminescent glow along the coastline.
Usage note. When used as a genus name, Noctiluca should be capitalized and italicized per biological nomenclature conventions; in informal or poetic usage it may appear lowercase.
Where it comes from
English noctiluca · entered English 19th c.
From modern Latin 'Noctiluca,' coined from classical Latin 'nox' (genitive 'noctis,' meaning night) and 'lux' (genitive 'lucis,' meaning light), thus literally 'night-light' or 'that which shines by night.' The Latin term was used in classical texts for phosphorescent sea phenomena, and the genus name was established in scientific nomenclature in the 19th century.