What you call it really doesn't matter. It's semantics. The bottom line is that it is slick and depending on the lighting it can be invisible.
I am super cautious because it can hurt you: 25 years ago it put me on the ground with a badly torn rotator cuff. Surgery, 6 weeks with the arm immobilized, 6 weeks in a sling, and 6 weeks of physical therapy. Fortunately my surgeon was a specialist in sports medicine who worked with a lot of pro athletes, the rehab went well, and I got back about 95% range of motion.
And I agree - This time of year the wet leaves on the bike trails are just as treacherous.