| MEE | measured energy expenditure; methylethyl ether; middle ear effusion; multilocus enzyme electrophores... |
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| MER | mean ejection rate; medical emergency room; methanol extraction residue; murmur/energy ratio |
| MIKE | mass-analyzed ion kinetic energy |
| PE | Edinburgh Pharmacopoeia; pancreatic extract; paper electrophoresis; partial epilepsy; pelvic examina... |
| PEM | pediatric emergency medicine; peritoneal exudate macrophage; polymorphic epithelial mucin; prescript... |
| external radiation | Radiation therapy that uses a machine located outside the body to aim high-energy rays at the cancer. (16 Dec 1997) |
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| external radiation therapy | Radiation therapy using a machine located outside the body to aim high-energy rays at a tumour. (12 Dec 1998) |
| ultraviolet radiation | <physics> Invisible light, next to visible light in the electromagnetic spectrum. The most common source of ultraviolet radiation is the sun. Acronym: UV (16 Dec 1997) |
| K-radiation | Usually a very penetrating form of x-radiation excited by cathode rays (high speed electrons) impinging upon a metal anode such as tungsten; the energy of the radiation is a function of the binding energy of the K-shell electrons of the metal anode. (05 Mar 2000) |
| L-radiation | An x-radiation of slight penetrating power excited by cathode rays (high speed electrons) impinging on a metal anode; the energy of the radiation is a function of the binding energy of the L-shell electrons of the metal anode. (05 Mar 2000) |