Astronomy •
Active galactic nucleus in astronomy •
Comet nucleus, the solid, central part of a comet
Biology •
Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell's DNA •
Nucleus (neuroanatomy), a cluster of cell bodies of neurons in the central nervous system • Nucleus that forms in the eye in
nuclear sclerosis (early cataracts) •
Nucleus, a scientific journal concerned with the cell nucleus; published by
Taylor & Francis •
Nucleus, a small colony of honeybees, induced to raise a new queen by the beekeeper
Computer systems •
Nucleus (operating system), sometimes a synonym for kernel •
Nucleus CMS, a weblog system •
Nucleus RTOS, a real-time operating system (RTOS) • Nucleus, part of an operating system loaded by an
Initial Program Load or boot loader
Mathematics •
Nucleus (algebra), the elements of a ring that associate with all others •
Nucleus (order theory), a mathematical term
Other sciences •
Nucleus (syllable), in linguistics, the central part of a syllable •
Atomic nucleus, the very dense central region of an atom •
Condensation nucleus, the seed of a raindrop •
Ice nucleus, the seed of a snowflake ==Arts and media==