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

Celsius

play
adjective Cel·si·us \ˈsel-sē-əs, -shəs\

Definition of Celsius

  1. :  relating to, conforming to, or having the international thermometric scale on which the interval between the triple point of water and the boiling point of water is divided into 99.99 degrees with 0.01° representing the triple point and 100° the boiling point <10° Celsius>; also :  centigrade —abbreviation C



Origin and Etymology of celsius

Anders Celsius


First Known Use: circa 1850


Celsius

play
biographical name Cel·sius \ˈsel-sē-əs, -shəs\

Definition of Celsius

  1. Anders 1701–1744 Swed. astron.




Medical Dictionary

Celsius

play
adjective Cel·sius \ˈsel-sē-əs, -shəs\

Medical Definition of Celsius

  1. :  relating to or having a scale for measuring temperature on which the interval between the triple point and the boiling point of water is divided into 99.99 degrees with 0.01° being the triple point and 100.00° the boiling point—abbreviation C; compare centigrade



Biographical Note for celsius

Celsius

,

Anders

(1701–1744), Swedish astronomer. Celsius's major contribution was his thermometer scale. Although not the first thermometer with a 100-degree scale, his scale, described in 1742, used the freezing and boiling points of water as its two fixed points, with 0° for the boiling point and 100° for the freezing point. Five years later the system was reversed so that 0° represented the freezing point and 100° represented the boiling point and then it gradually gained acceptance. Since about 1800 Celsius has been used as an adjective to designate a thermometer based on the revised scale and more recently to indicate the scale itself.


Learn More about celsius


Seen and Heard

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

WORD OF THE DAY

a talk on a religious or moral theme

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

lavender-fields-in-france

Which of these is a synonym of caesura?

megillah rebellion interruption torrent
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