|1.||of, used during, occurring in, or relating to the night|
|2.||(of animals) active at night|
|3.||(of plants) having flowers that open at night and close by day|
|[C15: from Late Latin nocturnālis, from Latin nox night]|
nocturnal noc·tur·nal (nŏk-tûr'nəl)
Of, relating to, or occurring in the night.
Most active at night.