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.
b : very great. Computer technology has made profound [=major, significant] changes in our lives. His paintings have had a profound effect/impact/influence on her own work. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples.