(redirected from nocturnally)
Also found in: Dictionary, Thesaurus, Medical.


1. (of animals) active at night
2. (of plants) having flowers that open at night and close by day


(religion, spiritualism, and occult)

Nocturnal means of or belonging to the night. In classical astrology, particular planets were classified as nocturnal or diurnal, no matter where they were in a horoscope. In contemporary astrology, planets are nocturnal if they are located below the horizon (in houses one through six). Many astrologers believe that planets above the horizon line show their influence more in the public sphere whereas planets below the horizon are more private, but this distinction clearly breaks down when considering planets in such locations as the twelfth house (a largely private house situated above the horizon). The expression nocturnal arc refers to the distance, expressed in degrees and minutes of a circle, that a planet traverses between its setting in the west and its rising in the east. Classical astrology also classified signs as diurnal (the masculine signs) and nocturnal (the feminine signs). Contemporary astrologers no longer use the expression nocturnal sign.


Bach, Eleanor. Astrology from A to Z: An Illustrated Source Book. New York: Philosophical Library, 1990.

Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New York: New American Library, 1980.


Active during the nighttime.
(science and technology)
Occurring during the nighttime.
References in periodicals archive ?
In the past 8 years, entomologist Bob Pfannenstiel and other ARS scientists have been studying the feeding habits of nocturnally active predators of pests in the Lower Rio Grande Valley in south Texas.
Abundances of nocturnally active taxa tend to be underestimated by data collected during daytime surveys (Ackerman and Belwood, 2000).
Friends describe him as a "devil, whore, alcoholic, sacred monster and a drunken, faded sodomite swaying nocturnally through the lowest dives and gambling dens of Soho" (New York magazine, 3/25/09).
Enallagma vesperum, is a crepuscular species with much of its mating activity occurring nocturnally.
Gravid females migrate nocturnally outside the anus and deposit eggs while crawling on the skin of the perianal area.
BUTTON MOON and Bagpuss may have proved an endless fascination to children through the years, but the attention they once held has long since been lost to a new generation of teen pop stars and strange creatures who move nocturnally around peculiar gardens.
His condition warranted a respiratory assist device (RAD) to be used nocturnally with an O2 bleed-in.
Nocturnally active spiders largely avoid the dangers of being exposed in a web by day, but still require a strategy to avoid predation during this time while the majority of predators are active.
Dipodomys elator is a nocturnally active species and previous researchers have utilized dim incandescent lighting to observe behavior.
quinquefasciatus, which bites only in darkness and transmits only nocturnally periodic Wi bancrofti in most endemic urban areas.
For example, thermal heterogeneity may be very limited for animals that are active nocturnally, or occupy dense forests where direct sunlight rarely penetrates to the forest floor (Vitt et al.