Across a half-permeable membrane, small plain-water molecules move (are attracted) towards the solution with the most dissolved molecules; small water molecules pass through the membrane from 'hypotonic' towards 'hypertonic.'
Clearly urine, is more concentrated in terms of the number of its dissolved molecules; it is hypertonic, therefore, compared to blood plasma.
If your Lecturer wanted a word for high-pressure urine, the best word would be hypertensive, or hyperdynamic urine. For an abnormally high volume secreted, it would be hypersecreted or hyper-produced urine. None of these words is actually in use.
"Tonicity" refers to the internal water-grabbing, or water-attracting effect of dissolved molecules. Tone is used in the sense of "resting power," or of how of much water-attractive resting power a solution has. Salts are certainly one type of dissolvable material, but the "osmotic effect" is often illustrated in textbooks by reference to dissolved sugar or treacle molecules, and neither of these is a salt.
In some contexts, Normo- is used as a prefix rather than Iso- .... for example, having a normal blood pressure is described as being normo-tensive, not as being iso-tensive.
Also, the connecting hyphen - is optional, ... it is usually omitted once you have the idea well practiced in your mind.
GT