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outer core is not in our dictionary (yet). Here's what it could mean:

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noun

  • The fluid layer of a planet's interior, composed primarily of iron and nickel, situated between the solid inner core and the mantle.

Example Sentences

Examples are provided to illustrate usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The results showed that the upper boundary of the outer core does not have a uniform temperature.

From Science Daily • Feb. 5, 2026

“What we’re observing in this study for the first time is likely the outer core disturbing the inner core.”

From Los Angeles Times • Feb. 11, 2025

Thesaurus

Possible Synonyms

  • liquid core layer
  • sub-mantle fluid
  • geodynamo region

Possible Antonyms

Words in our thesaurus

other words

  • surface layer
  • lithosphere
  • solid core
  • inner core

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