nucleus /nūˈkli-əs/

1. A central mass or kernel
2. That around which something may grow
3. A compartment within the interphase eukaryotic cell bounded by a double membrane and containing the genomic DNA (biology)
4. The massive part of an atom, containing protons and neutrons and distinguished from the outlying electrons (physics)
5. A stable group of atoms to which other atoms may be attached so as to form a series of compounds (chem)
6. A core of flint from which pieces have been flaked off
7. The densest part of a comet's head or a nebula
8. A nut kernel (obsolete)
9. A nucellus (obsolete)

nucleic acid /nū-klēˈik or -klāˈ/ noun

A general term for a natural polymer (which can be single- or double-stranded) in which bases (purines or pyrimidines) are attached to a sugar phosphate backbone

nucleus accumbens /ə-kum'benz/ noun

(L accumbens lying down) a structure in the brain associated with feelings of pleasure and reward

• spokeswoman
• spokeswomen
• spokewise
• spolia opima
• spoliate
• spoliated
• spoliates
• spoliating
• spoliation
• spoliations
• spoliative
• spoliator
• spoliators
• spoliatory
• spondaic
• spondaical
• spondee
• spondees
• spondoolicks
• spondulicks
• spondulix
• spondyl
• spondylitic
• spondylitics
• spondylitis