A person or thing that propagates, especially a person who spreads or promotes an idea, theory, etc.
The scientist was a well-known propagator of the new theory on climate change.
A container or structure used for growing plants from seeds or cuttings under controlled conditions.
She placed the seedlings in the propagator to ensure they had the right temperature and humidity to grow.
In physics, especially quantum mechanics and quantum field theory, a function or operator that describes the probability amplitude for a particle, field, or signal to propagate from one point to another.
The Feynman propagator provides the amplitude for a particle to travel between spacetime points.