Usually means: Insulated container for storing cryogens.
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We found 20 dictionaries that define the word dewar:

General (13 matching dictionaries)
  1. Dewar, dewar: Merriam-Webster
  2. Dewar, dewar: Oxford Learner's Dictionaries
  3. Dewar: Collins English Dictionary
  4. Dewar: Vocabulary.com
  5. Dewar: Wordnik
  6. Dewar, dewar: Wiktionary
  7. Dewar: Infoplease Dictionary
  8. dewar: Dictionary.com
  9. Dewar: Wikipedia, the Free Encyclopedia
  10. Dewar: Rhymezone
  11. dewar: FreeDictionary.org
  12. dewar: Mnemonic Dictionary
  13. Dewar: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Dewar: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. dewar: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. DEWAR: Acronym Finder

Science (1 matching dictionary)
  1. Imagine the Universe! Dictionary (No longer online)

Slang (1 matching dictionary)
  1. Dewar: Urban Dictionary

Tech (1 matching dictionary)
  1. High-Energy Astrophysics (No longer online)

(Note: See dewars as well.)

Definitions from Wiktionary (Dewar)

noun:  A surname from Scottish Gaelic.
noun:  An unincorporated community in Black Hawk County, Iowa, United States.
noun:  A city in Okmulgee County, Oklahoma, United States.
noun:  A glass or metal double-walled flask for holding a liquid without much loss or gain of heat; a vacuum bottle or thermos. Generally used for scientific purposes and in particular for cryogenic work.
noun:  A vacuum flask; a vessel which keeps its contents hotter or cooler than their environment without the need to modify the pressure, by interposing an evacuated region to provide thermal insulation between the contents and the environment.

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