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

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noun

  • The centermost layer of the Earth, a solid sphere composed primarily of an iron-nickel alloy.

Example Sentences

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

Golf balls’ outer layer and inner core are made from synthetic polymers, which are created from chemicals often derived from petroleum.

From The Wall Street Journal • Mar. 21, 2026

The inner core of solid tumors is made up of dead cells and lacks oxygen, creating the perfect conditions for this microbe to multiply and spread.

From Science Daily • Feb. 24, 2026

Thesaurus

Possible Synonyms

  • innermost geosphere
  • Earth's center
  • solid core
  • the heart of the planet
  • the planet's solid nucleus

Possible Antonyms

Words in our thesaurus

other words

  • exosphere
  • outer core
  • Earth's surface

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