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.
2. originating in the depths of one's being: profound grief. 3. going beyond what is superficial or obvious: profound insight. 4. of deep significance: a profound book. 5. complete and pervasive: a profound silence. 6. extending or situated far beneath the surface: the profound depths of the ocean. 7. low: a profound bow.