Yes, prandial refers to a meal. It is most often used in the context of postprandial meaning after a meal.

is a 172 post prandial blood sugar high

what is considered a high post prandial blood sugar

Post-prandial means "after a meal". Thus, a post-prandial blood glucose represent the blood sugar value obtained after eating a meal. At the 2 hour point the goal is around 8 mol/l

Post prandial blood sugar

If one of "the following" is "post-prandial" it's that one.