Pill (noun)

1. A small, round, solid piece of medicine that is taken orally.
2. A small, round, solid piece of medicine that is taken by mouth.
3. A small, round, solid piece of medicine that is intended to be swallowed.

Origin:

Late middle english: from old french pilule, from latin pilula, diminutive of pila "ball".

Examples:

1. He took a pill for his headache.
2. She had to take a pill every day.
3. The pills were in a bottle.
4. He swallowed the pill with water.
5. She had to take a pill before eating.