Related Clues:

• It was once thought to be indivisible
• Ninth letter in old Athens
• Electron's place
• Jot or tittle
• What's the matter?
• Particle
• Whit or bit
• It's little matter
• Half the dictionary?
• Miniscule amount
• Tiny little bit
• Powerful mite
• Something to smash
• Wee parasite
• Label on the first of two file drawers, maybe