from The American Heritage® Dictionary of the English Language, 4th Edition
- n. See centrosphere.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The central core of the Earth.
from the GNU version of the Collaborative International Dictionary of English
- n. The heavy interior portion of the earth, within the lithosphere.
from The Century Dictionary and Cyclopedia
- n. The earth's interior, an inner core known to be of greater density than the crust: so named from this property.
Greek barus, heavy; see gwerə-1 in Indo-European roots + sphere.(American Heritage® Dictionary of the English Language, Fourth Edition)
Greek barus 'heavy' + sphere. (Wiktionary)