(For one thing, I think that definition may imply that an electron is bigger than me?)
An electron’s wavefunction is actually more spread out than yours is (if we could do a quantum measurement on the position of your center of mass—which we can’t because it’s too hard to isolate you from the environment—it would be very precise).
But because you’re a macroscopic object, how big you are isn’t determined by your center of mass wavefunction, but by the distance between the different atoms comprising you. So you’re bigger than a standard electron.
For a hydrogen atom at room temperature, the size of the electron orbital and the size due to a spread-out wavefunction are actually about the same. So for interactions involving hydrogen atoms, the wavefunction size is really important.
An electron’s wavefunction is actually more spread out than yours is (if we could do a quantum measurement on the position of your center of mass—which we can’t because it’s too hard to isolate you from the environment—it would be very precise).
But because you’re a macroscopic object, how big you are isn’t determined by your center of mass wavefunction, but by the distance between the different atoms comprising you. So you’re bigger than a standard electron.
For a hydrogen atom at room temperature, the size of the electron orbital and the size due to a spread-out wavefunction are actually about the same. So for interactions involving hydrogen atoms, the wavefunction size is really important.