Impaction
1. (Science: surgery) The driving of one fragment of bone into another so that the fragments are not movable upon each other; as, impaction of the skull or of the hip.
2. (Science: medicine) An immovable packing;, a lodgment of something in a strait or passage of the body; as, impaction of the foetal head in the strait of the pelvis; impaction of food or feces in the intestines of man or beast.
Origin: L. Impactio a striking: cf. F. Impaction.
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..
For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..
Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..
The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..
ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..