Asteroids are celestial rocky bodies that orbit the sun. It was Sir William Herschel who first coined the term âasteroidâ (Greek for star-like) in 1802. He thought that Ceres and Pallas, discovered in 1801 by Giuseppe Piazzi and Heinrich Olbers respectively, were too small and were remnants of a destroyed planet.
blood cell. n. Any of the cells contained in blood; an erythrocyte or leukocyte; a blood corpuscle. blood cell. n. (Physiology) any of the cells that circulate in the blood. See erythrocyte, leucocyte.
There are three main types of blood cells in the human body. These are the red blood cells, white blood cells and platelets. The red blood cells are also known as erythrocytes, white blood cells as leukocytes, and platelets as thrombocytes.here are three main types of blood cells in the human body. These are the red blood cells, white blood cells and platelets. The red blood cells are also known as erythrocytes, white blood cells as leukocytes, and platelets as thrombocytes.