day lengthn.adj.

Brit.

/ˈdeɪ lɛŋ(k)θ/, U.S.

/ˈdeɪ ˌlɛŋθ/

Origin: Formed within English, by compounding. Etymons: day n., length n.

Etymology: < day n. + length n.

A. n.

1. The length of the day, either: (a) the time between sunrise and sunset (i.e. the duration of daylight), esp. as it varies at different times of the year or at different latitudes; or (b) the time from one sunrise to the next (on earth currently 24 hours). Also as a count noun: a day of a specified length.Apparently rare during the 19th cent.

ΘΚΠ

the world > time > duration > [noun] > of a specific period

spacea1350

daya1393

spacie1540

day length1569

run1674

1569 W. Samuel Abridgem. Olde Test.: Josh. x. sig. F.v^v The Sun stood stil a whole day length and haile did beat them down.

1718 Almanack (single sheet) Day length. 6 h. 42 m.

1759 S. Dunn Descr. & Use Universal Planispheres (ed. 2) 114 Times. Places. Day Length. Night Length.

1900 Jrnl. School Geogr. 4 30 An error in my diagram of day length.

1989 J. Heidmann Cosmic Odyssey i. 9 About 400 million years ago the day length was 22 hours.

2000 R. C. L. Wilson et al. Great Ice Age (2005) viii. 208 English winter day length is about 8 hours long, summer day length about 18 hours.

2010 D. A. Rothery Planets: Very Short Introd. i. 8 Rotation period is how long it takes a planet to spin once on its axis. For a rapidly spinning planet, this is almost the same as the time from one sunrise to the next (the planet's own ‘day length’).

2013 A. J. Vega et al. Lousiana Weather & Climate (rev. ed.) v. 41 Day length varies little annually in the state compared with most of the rest of the United States because of Louisiana's fairly low latitude.

2. Biology. The length of daily illumination which an organism receives; the length of light exposure which is most effective in stimulating a particular physiological process, such as reproduction, in a plant or other organism; = photoperiod n. Also: the length of a circadian cycle.

ΘΚΠ

the world > life > biology > biological processes > light-related processes > [noun] > photoregulation > period of exposure to daylight

day length1920

photoperiod1920

1920 W. W. Garner & H. A. Allard in Jrnl. Agric. Res. 18 582 The Stewart Cuban Mammoth tobacco..requires a day length of 12 hours or less to attain the blossoming stage.

1952 Sci. Monthly Apr. 191/1 Experimentation has demonstrated that increasing day length is an important factor in initiating migratory behavior and gonadal growth in North Temperate species.

1984 Neurosci. Lett. 45 317 Suitably administered, it [sc. melatonin] can mimic some, possibly all, of the effects of day length on reproductive function in photoperiodic seasonal breeders.

1996 S. Coren Sleep Thieves (1997) 86 Even though they still have no clocks or other signals, our research subjects continue to have a regular 24-hour day length.

2003 Guardian 29 Aug. (Life section) 2/1 Temperature and day length are the two main cues trees use to work out when to shed their leaves.

B. adj.

Designating clothes (esp. dresses and skirts) that are shorter in length than evening clothes, and typically intended for use during the day.

ΘΚΠ

the world > textiles and clothing > clothing > types or styles of clothing > [adjective] > for specific purpose > other

morningc1620

tropical1774

underground1827

lingeriea1865

summer weight1866

winter weight1871

knockabout1880

dog robber1898

Ascot1907

day length1932

live-in1944

1932 Times of India 31 Dec. 19/2 Latest fashion notes from Paris... The day-length evening ensemble is also another mode which is going to be triumphant.

1937 Times 13 Sept. 15/6 These lamé dresses..have day-length skirts, high necks, and long, plain sleeves.

1950 New Yorker 21 Jan. 80/2 A skirt that is day length in front but floor length and full at the sides and the back.

1965 Harper's Bazaar Jan. 54/1 He will charge you about 20 or 25 gns. for a day-length dress.

1988 N.Y. Mag. 31 Oct. 111/1 Bill Blass sequined day-length dress.

Compounds

daylength-neutral adj. Botany = day-neutral adj. at day n. Compounds 3.

ΚΠ

1936 Jrnl. Pomol. & Hort. Sci. 14 30 It is of interest to note that the wild forms of Lactuca scariola and L. virosa all carry the recessive factor for reaction to day length, that is they are day length neutral.

1987 J. T. Swarbrick & B. L. Mercado Weed Sci. & Weed Control in Southeast Asia FAO Plant Production & Protection Paper 81 31 Amaranthus spinosus is daylength neutral but exhibits maximum flowering at 11 to 12 hours daylength.

2003 Oecologia 135 195/1 Age at flowering may also be affected by elevated [CO₂], which has been shown to accelerate the onset of flowering and other reproductive events in long-day and daylength-neutral plants.

This entry has been updated (OED Third Edition, September 2014; most recently modified version published online March 2022).

单词	day length
释义	day lengthn.adj. Brit. /ˈdeɪ lɛŋ(k)θ/, U.S. /ˈdeɪ ˌlɛŋθ/ Origin: Formed within English, by compounding. Etymons: day n., length n. Etymology: < day n. + length n. A. n. 1. The length of the day, either: (a) the time between sunrise and sunset (i.e. the duration of daylight), esp. as it varies at different times of the year or at different latitudes; or (b) the time from one sunrise to the next (on earth currently 24 hours). Also as a count noun: a day of a specified length.Apparently rare during the 19th cent. ΘΚΠ the world > time > duration > [noun] > of a specific period spacea1350 daya1393 spacie1540 day length1569 run1674 1569 W. Samuel Abridgem. Olde Test.: Josh. x. sig. F.v^v The Sun stood stil a whole day length and haile did beat them down. 1718 Almanack (single sheet) Day length. 6 h. 42 m. 1759 S. Dunn Descr. & Use Universal Planispheres (ed. 2) 114 Times. Places. Day Length. Night Length. 1900 Jrnl. School Geogr. 4 30 An error in my diagram of day length. 1989 J. Heidmann Cosmic Odyssey i. 9 About 400 million years ago the day length was 22 hours. 2000 R. C. L. Wilson et al. Great Ice Age (2005) viii. 208 English winter day length is about 8 hours long, summer day length about 18 hours. 2010 D. A. Rothery Planets: Very Short Introd. i. 8 Rotation period is how long it takes a planet to spin once on its axis. For a rapidly spinning planet, this is almost the same as the time from one sunrise to the next (the planet's own ‘day length’). 2013 A. J. Vega et al. Lousiana Weather & Climate (rev. ed.) v. 41 Day length varies little annually in the state compared with most of the rest of the United States because of Louisiana's fairly low latitude. 2. Biology. The length of daily illumination which an organism receives; the length of light exposure which is most effective in stimulating a particular physiological process, such as reproduction, in a plant or other organism; = photoperiod n. Also: the length of a circadian cycle. ΘΚΠ the world > life > biology > biological processes > light-related processes > [noun] > photoregulation > period of exposure to daylight day length1920 photoperiod1920 1920 W. W. Garner & H. A. Allard in Jrnl. Agric. Res. 18 582 The Stewart Cuban Mammoth tobacco..requires a day length of 12 hours or less to attain the blossoming stage. 1952 Sci. Monthly Apr. 191/1 Experimentation has demonstrated that increasing day length is an important factor in initiating migratory behavior and gonadal growth in North Temperate species. 1984 Neurosci. Lett. 45 317 Suitably administered, it [sc. melatonin] can mimic some, possibly all, of the effects of day length on reproductive function in photoperiodic seasonal breeders. 1996 S. Coren Sleep Thieves (1997) 86 Even though they still have no clocks or other signals, our research subjects continue to have a regular 24-hour day length. 2003 Guardian 29 Aug. (Life section) 2/1 Temperature and day length are the two main cues trees use to work out when to shed their leaves. B. adj. Designating clothes (esp. dresses and skirts) that are shorter in length than evening clothes, and typically intended for use during the day. ΘΚΠ the world > textiles and clothing > clothing > types or styles of clothing > [adjective] > for specific purpose > other morningc1620 tropical1774 underground1827 lingeriea1865 summer weight1866 winter weight1871 knockabout1880 dog robber1898 Ascot1907 day length1932 live-in1944 1932 Times of India 31 Dec. 19/2 Latest fashion notes from Paris... The day-length evening ensemble is also another mode which is going to be triumphant. 1937 Times 13 Sept. 15/6 These lamé dresses..have day-length skirts, high necks, and long, plain sleeves. 1950 New Yorker 21 Jan. 80/2 A skirt that is day length in front but floor length and full at the sides and the back. 1965 Harper's Bazaar Jan. 54/1 He will charge you about 20 or 25 gns. for a day-length dress. 1988 N.Y. Mag. 31 Oct. 111/1 Bill Blass sequined day-length dress. Compounds daylength-neutral adj. Botany = day-neutral adj. at day n. Compounds 3. ΚΠ 1936 Jrnl. Pomol. & Hort. Sci. 14 30 It is of interest to note that the wild forms of Lactuca scariola and L. virosa all carry the recessive factor for reaction to day length, that is they are day length neutral. 1987 J. T. Swarbrick & B. L. Mercado Weed Sci. & Weed Control in Southeast Asia FAO Plant Production & Protection Paper 81 31 Amaranthus spinosus is daylength neutral but exhibits maximum flowering at 11 to 12 hours daylength. 2003 Oecologia 135 195/1 Age at flowering may also be affected by elevated [CO₂], which has been shown to accelerate the onset of flowering and other reproductive events in long-day and daylength-neutral plants. This entry has been updated (OED Third Edition, September 2014; most recently modified version published online March 2022). < n.adj.1569
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