Usually means: Temperature wave propagation in helium.
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We found 5 dictionaries that define the word second sound:

General (3 matching dictionaries)
  1. second sound: Merriam-Webster
  2. second sound: Wiktionary
  3. Second sound: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. second sound: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (second sound)

noun:  (physics) A wave of fluctuating temperature or entropy propagated in the superfluid phase of liquid helium.

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