Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

cosmic ray

noun

Simple Definition of cosmic ray

  • : a stream of energy that enters the Earth's atmosphere from outer space

Source: Merriam-Webster's Learner's Dictionary

Full Definition of cosmic ray

  1. :  a stream of atomic nuclei of extremely penetrating character that enter the earth's atmosphere from outer space at speeds approaching that of light

1925

First Known Use of cosmic ray

1925

Rhymes with cosmic ray

Adige, A-OK, alleyway, All Fools' Day, All Saints' Day, All Souls' Day, all the way, anyway, appliqué, Arbor Day, arrivé, atelier, attaché, back away, ballonet, bang away, Bastille Day, Beaujolais, beta ray, beurre manié, BHA, blow away, botonée, Boxing Day, breakaway, break away, Bristol Bay, bustier, by the way, cabaret, cableway, Camagüey, canapé, cap-a-pie, Cape Cod Bay, caraway, carriageway, cassoulet, castaway, cathode ray, champlevé, chansonnier, chardonnay, Charolais, chevalier, china clay, cloisonné, cog railway, colorway, Condorcet, consommé, coryphée, croupier, crudités, cutaway, day-to-day, debauchee, déclassé, dégagé, degree-day, delta ray, démodé, devotee, disarray, disobey, distingué, divorcé, divorcée, DNA, dollar day, double play, draw away, dress-down day, eagle ray, eightfold way, émigré, engagé, entranceway, entremets, entryway, espalier, everyday, exposé, expressway, fadeaway, fallaway, fall away, faraday, Faraday, faraway, fiancé, fiancée, fill away, fire away, flageolet, flyaway, foldaway, gal Friday, gamma ray, garde-manger, Georgian Bay, getaway, girl Friday, giveaway, give away, gratiné, gratinée, Greenaway, Groundhog Day, guillemet, Harare, hell to pay, Hemingway, hereaway, hideaway, hit the hay, HLA, holiday, holy day, Hornaday, Hudson Bay, Hugh Capet, Humboldt Bay, in a way, inter se, interplay, intraday, IPA, IRA, Ise Bay, judgment day, keep-away, kyrie, Labor Day, lackaday, latter-day, layaway, lay away, lingerie, macramé, Mandalay, manta ray, Massenet, matinee, medal play, meet halfway, MIA, Milky Way, Monterrey, Mother's Day, motorway, muscadet, mystery play, negligee, New Year's Day, New York Bay, Nicolet, night and day, Nottaway, off Broadway, Ojibwa, on the way, out of play, overlay, overplay, overstay, overweigh, Paraguay, passageway, pass away, passion play, pepper spray, Petare, photoplay, pikake, pis aller, play-by-play, plug-and-play, popinjay, potter's clay, pourparler, pousse-café, power play, present-day, protégé, protégée, pull away, put away, Put-in-Bay, Rabelais, rack railway, rainy-day, rambouillet, ratiné, recamier, recherché, reconvey, repartee, repoussé, résumé, retroussé, ricochet, right away, right-of-way, rockaway, roentgen ray, rondelet, roundelay, RNA, runaway, run away, Saguenay, salt away, San Jose, Santa Fe, São Tomé, Saturday, satyr play, semplice, Seventh-Day, severance pay, shadow play, sleepaway, sobriquet, sock away, sommelier, square away, steerageway, standaway, stowaway, straightaway, street railway, Table Bay, taboret, tarsier, taxiway, tearaway, tear away, teleplay, Tenebrae, thataway, throwaway, throw away, Thunder Bay, triple play, turn away, Udine, underlay, underpay, underplay, underway, Uruguay, velouté, Venite, vérité, vertebra, virelay, walkaway, Wang Ching-wei, waterway, wellaway, Whitsunday, workaday, working day, Yenisey, Zuider Zee


COSMIC RAY Defined for Kids

cosmic ray

noun

Definition of cosmic ray for Students

  1. :  a stream of very penetrating particles that enter the earth's atmosphere from outer space at high speed




Learn More about cosmic ray


Seen and Heard

What made you want to look up cosmic ray? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

immature or lacking adult sophistication

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

maudlin prompt oily angry
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ