Related Clues:
- Tiny piece using only half of alphabet
- Shred a short book
- Minute particle of matter
- Physics focus
- Tiny portion
- Bond holder?
- Supercollider bit
- Basic unit in flat omitted
- One of 24 in a glucose molecule
- Particle; molecule
- Chemistry class subject
- Ion, e.g
- What 2-Down studied
- Radical component
- Half of a two-volume encyclopedia, say