1. plural of nucleus; the central parts of atoms, cells, or other structures
Usage: plural form

Examples

• The atomic nuclei contain protons and neutrons.
• Cell nuclei control the activities of the cells.
• Scientists studied the nuclei of several different elements.
• The nuclei of these cells appeared enlarged under the microscope.
• Heavy nuclei can be split in nuclear fission reactions.
• The nuclei of nerve cells are located in the cell bodies.