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

adiabatic

play
adjective adi·a·bat·ic \ˌa-dē-ə-ˈba-tik, ˌā-ˌdī-ə-\

Definition of adiabatic

  1. :  occurring without loss or gain of heat <adiabatic expansion of a gas>

adi·a·bat·i·cal·lyplay \-ti-k(ə-)lē\ adverb


Origin of adiabatic

Greek adiabatos impassable, from a- + diabatos passable, from diabainein to go across, from dia- + bainein to go — more at come


First Known Use: 1859


Seen and Heard

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

WORD OF THE DAY

February 10, 2016

to put in good humor

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

pince-nez spindrift duvet kittly-benders
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ