helioseismology
noun
-sīs-\
Definition of helioseismology
: the study of vibrations in the material that makes up the Sun Scientists have discovered that the sun is vibrating, and they can detect this “global oscillation” using the new techniques of “helioseismology,” which are similar to those used in terrestrial seismology.— Madeleine Jacobs, Chicago Tribune, 29 Dec. 1985
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