by Anne Marie Helmenstine, Ph.D. Updated June 13, 2014. Definition: A molecular orbital is an orbital or wavefunction of a molecule's electron. Electrons around a molecule can be associated with more than one atom and are often expressed as a combination of atomic orbitals.
Hereditary angioedema is a disorder characterized by recurrent episodes of severe swelling (angioedema). The most common areas of the body to develop swelling are the limbs, face, intestinal tract, and airway. Minor trauma or stress may trigger an attack, but swelling often occurs without a known trigger.
Angioedema is like hives, but with hives there are itchy red welts on the surface of your skin. Angioedema is a deeper swelling. Both hives and angioedema are usually caused by an allergic reaction to either a food or medication. Things like pollen or insect stings can also cause angioedema.In rare cases, it may be a sign of an underlying condition, such as leukemia or Hodgkin's disease. There are two basic types of angioedema:ngioedema is like hives, but with hives there are itchy red welts on the surface of your skin. Angioedema is a deeper swelling. Both hives and angioedema are usually caused by an allergic reaction to either a food or medication. Things like pollen or insect stings can also cause angioedema.