Definition of helioseismology in US English:

helioseismology

noun

Astronomy
  • The study of the sun's interior by the observation and analysis of oscillations at its surface.

Origin

1970s; earliest use found in Soviet Astronomy. From helio- + seismology.

Pronunciation

helioseismology

/ˌhiːlɪəʊsʌɪzˈmɒlədʒi/