, the kernel, is used by Hevelius, and some other astronomers, for the body of a comet, which others call its head, as distinguished from its tail, or beard.
Nucleus is also used by some writers for the central parts of the earth, and other planets, which they suppose firmer, and as it were separated from them, considered as a cortex or shell.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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