A kernel; a central part about which matter collects.

核；仁。

Anything that serves as the center of growth or development.

核心；中心。

Central, rounded, or oval mass of protoplasm in a cell, regarded as essential to growth, reproduction, and heredity.

【生物】细胞核。

Group of nerve-cell bodies in the brain or spinal chord, from which arise nerve fibers that are distributed to one limited part of the body.

【解】神经核。

Small bright central point in a comet's head.

【天】慧星核。

Positively charged central portion of an atom consisting of nucleons and having nearly all the mass of the atom, around which the elections revolve.

【理】【化】原子核。