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pl. nuclei [L., nucleus, kernel]
1. A central point about which things are clustered.
2. The organelle in a eukaryotic cell that contains the chromosomes.
SYN: SEE: cell nucleus
3. In the central nervous system, a group of neuronal cell bodies that are clustered together and form a coherent demarcated mass in stained brain sections. SEE: 4. Atomic nucleus.