inner core

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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

"For the first time, we've experimentally shown that iron-carbon alloy under inner core conditions exhibits a remarkedly low shear velocity." said Prof. Zhang.

From Science Daily ● Dec. 10, 2025

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