diurnaldi‧ur‧nal /daɪˈɜːnəl $ -ˈɜːr-/ adjective technical 
Word Origin
Word OriginWORD ORIGINdiurnal
ExamplesOrigin:
1300-1400 Latin diurnalis, from dies ‘day’EXAMPLES FROM OTHER DICTIONARIES
word sets- diurnal animals such as cows
- The plains have a wide range of diurnal and annual temperatures.
- Desert areas on Earth often have wide diurnal temperature ranges due to nighttime radiative cooling through very clear skies.
- Figure 1 shows the average diurnal variation of ozone and total peroxide in baseline air for January 1992.
- In all three cases, the 17-OHCS are elevated and there is no diurnal variation.
- Many of the diurnal, or daylight-active species are popular aquarium subjects, but there are also several popular nocturnal species.
- Many reptiles have a preferred temperature range within internally regulated diurnal rhythms.
- Several studies on digestion of bone by captive owls and diurnal birds of prey have been published.
- These differences produce corresponding differences in the bone assemblages produced by owls and diurnal raptors.
- Two further categories of incisor digestion can be recognized here, covering all the diurnal raptors.
WORD SETS► Chronology
CollocationsAD, advance, verbafter, prepositionafternoon, nounalarm, nounalarm clock, nouna.m., Anno Domini, annual, adjectiveApril, nounAsh Wednesday, nounAug., August, nounautumn, nounautumnal, adjectivebank holiday, nounBC, BCE, biannual, adjectivebicentenary, nounbicentennial, nounbiennial, adjectivebimonthly, adjectivebirthday, nounbiweekly, adjectivebonfire night, nounBoxing Day, nounBritish Summer Time, nounBST, nouncalendar, nouncalendar month, nouncalendar year, nouncarriage clock, nouncentenary, nouncentury, nounChristmas, nounChristmas Day, nounChristmas Eve, nounChristmastime, nounchronograph, nounchronological, adjectivechronometer, nouncircadian, adjectiveclock, nouncrystal, nouncuckoo clock, nouncycle, nouncyclic, adjectivedaily, adjectivedaily, adverbdate, noundate, verbdawn, nounday, nounDec., decade, nounDecember, noundiamond anniversary, noundiamond jubilee, noundinnertime, noundiurnal, adjectived.o.b., due date, noundusk, nounface, nounFather's Day, nounfeast, nounFebruary, nounfortnightly, adjectiveFourth of July, the, Fri., Friday, nounGood Friday, nounGreenwich Mean Time, nounGregorian calendar, nounguy, nounGuy Fawkes Night, nounhalf-hourly, adjectivehalf-yearly, adjectiveHalloween, nounhand, nounHanukkah, nounharvest festival, nounHogmanay, nounhorn, nounhour, nounhourglass, nounhour hand, nounhr, Independence Day, nounJan., January, nounjubilee, nounJuly, nounJune, nounLabor Day, nounleap year, nounlunar month, nounmainspring, nounman-hour, nounMar., March, nounMardi Gras, nounmarket day, nounMaundy Thursday, nounMay, nounMay Day, nounMichaelmas, nounmidday, nounmiddle age, nounmiddle-aged, adjectivemidnight, nounMidsummer Day, nounmidweek, adjectivemillennium, nounmin., minute hand, nounMon., Monday, nounmonth, nounmorn, nounmorning, nounMothering Sunday, nounMother's Day, nounmovable feast, nounnew moon, nounNew Year, nounNew Year's Day, nounNew Year's Eve, nounnight, nounnightfall, nounnighttime, nounnocturnal, adjectiveNoel, nounnoon, nounnoonday, adjectiveNov., November, nounOct., October, nounp.a., Pancake Day, nounPDT, penultimate, adjectiveper annum, adverbper diem, adverbperiodic, adjectivep.m., PST, public holiday, nounquarter, nounquotidian, adjectiveRemembrance Day, nounSat., Saturday, nounschoolday, nounseason, nounsecond, nounsecond hand, nounself-winding, adjectiveSeptember, nounshockproof, adjectivesilver anniversary, nounsilver jubilee, nounsilver wedding anniversary, nounsolar year, nounsolstice, nounspring, nounspringtime, nounstandard time, nounstopwatch, nounsummer, nounsummer solstice, nounsummertime, nounsummery, adjectiveSun., Sunday, nounsundown, nounsunrise, nounsunset, nounsun-up, nountercentenary, nounThanksgiving, nounthirty, numberThursday, nountime, nountime, verbtimepiece, nountimer, nountime signal, nountime warp, nountime zone, nountoday, adverbtoday, nountomorrow, adverbtomorrow, nountonight, adverbtonight, nountriennial, adjectiveTuesday, nountwilight, nounWed., Wednesday, nounweek, nounweekday, nounweekend, nounweekly, adjectiveweeknight, nounWhit, nounWhitsun, nounwinter, nounwintertime, nounwk., wristwatch, nounyear, nounyesterday, adverbyr., Yule, nounYuletide, noun
COLLOCATIONS FROM THE CORPUSNOUN► variation
1happening or active in the daytime OPP nocturnal2happening every day· Figure 1 shows the average diurnal variation of ozone and total peroxide in baseline air for January 1992.· In all three cases, the 17-OHCS are elevated and there is no diurnal variation.· This is high enough to permit observation if the diurnal variation.· Such diurnal variations may possibly explain why two of the patients showed increased bile acid synthesis but normal SeHCAT values.· The colonoscopies were carried out between 1100 and 1300 to allow for diurnal variation in proliferation rates.