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.
Wiktionary(1.00 / 1 vote)Rate this definition: 1  profound(Noun) The deep; the sea; the ocean. 2  profound(Noun) An abyss. 3  profound(Verb) To cause to sink deeply; to cause to dive or penetrate far down.  profound(Verb) To dive deeply; to 1  penetrate. profound(Adjective) Descending far below the surface; opening or reaching to a great depth; deep.