Hematocrit is a blood test that measures the percentage of the volume of whole blood that is made up of red blood cells. This measurement depends on the number of red blood cells and the size of red blood cells.
Definition of profound for Students. 1  1 : having or showing great knowledge and understanding a profound thinker. 2  2 : very deeply felt profound sorrow.
1. keen-having or demonstrating ability to recognize or draw fine distinctions; an acute observer of politics and politicians; incisive comments; icy knifelike reasoning; as sharp and incisive as the stroke of a fang; penetrating insight; frequent penetrative observations.