any of several night-blooming cacti of the genus Selenicereus
any of several cacti of the genus Cereus
any of several cacti of the genus Hylocereus
the time after sunset and before sunrise while it is dark outside
the dark part of the diurnal cycle considered a time unit
a period of ignorance or backwardness or gloom
the period spent sleeping
the time between sunset and midnight
Roman goddess of night; daughter of Erebus; counterpart of Greek Nyx