What is the difference between osmotic pressure and osmotic gradient?

Imagine two containers separated with a semipermeable membrane, permeable to water only. Left side contains a 1M NaCl soln, while the right contains a 2M NaCl soln. The water will move from the left into the right, right? Why did it do so in the first place? It was because of the OSMOTIC GRADIENT. There was a difference in NaCl concentrations, creating a gradient, and thus inducing osmosis to the right container. Osmotic pressure then, is the pressure you would have to apply to keep the water from going to the right side. In your experiment, the osmotic gradient is provided by the molasses/glucose solutions, relative to the egg. And the greater the gradient, the greater the osmotic pressure (the more pressure the walls of the egg have to exert to keep water from coming in/out). So the molasses/water parts would induce the greatest gradient and therefore the greatest pressure (because a lot of water left/entered).