Drugs Information Online
Drugs and diseases reference index

Drugs and diseases reference index
Search
EN

Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «M»:

  1. Microduplication Microduplication
    Microduplication: The gain of a tiny piece of a chromosome, a piece so small its presence is not apparent on ordinary examination (using a regular light microscope to look at chromosomes prepared in the usual fashion). The detection of microduplications requires special techniques such as high-resol...
  2. Microduplication 22q11.2 syndrome Microduplication 22q11.2 syndrome
    Microduplication 22q11.2 syndrome: A syndrome due to duplication of a tiny part of chromosome band 22q11.2. Features of the syndrome include the appearance of widely spaced eyes and superior placement of eyebrows; downslanting palpebral fissures (eye slits); mild micrognathia (small chin) and retrog...
  3. Microembolus Microembolus
    Microembolus: An embolus of microscopic size. For example, a tiny blood clot or little clump of bacteria. Like any embolus, it travels through the bloodstream, lodges in a blood vessel and blocks it....
  4. Microhematuria Microhematuria
    Microhematuria: Hematuria means blood in the urine and microhematuria refers to hematuria that is visible only under a microscope. There is so little blood that it cannot be seen without magnification. Microhematuria is in contrast to gross hematuria in which the blood is so plentiful that it is vis...
  5. Microorchidism Microorchidism
    Microorchidism: Abnormally small testes. To determine if the testes are too small, a device called an orchidometer is used that permits the testes to be compared to a series of plastic ovals (like miniature American footballs) of differing sizes. Microorchidism is a diagnostic feature, for example, ...
  6. Micropenis Micropenis
    Micropenis: An abnormally small penis. In medical practice, the dimension of the penis that is measured is the length. This measurement is taken along the upper surface of the shaft of the penis to the tip, using a measuring tape or, preferably, a ruler. The ruler is pressed firmly into the soft tis...
  7. Microphallus Microphallus
    Microphallus: An abnormally small penis. Also called micropenis. In medical practice, the dimension of the penis that is measured is the length. The measurement is taken along the upper surface of the shaft of the penis to the tip, using a measuring tape or preferably a ruler. The ruler is pressed ...
  8. Microphthalmia Microphthalmia
    Microphthalmia: An abnormally small eye, a congenital malformation (birth defect) of the globe. The related term "anophthalmia" means no eye and refers to absence of the globe and ocular tissue from the orbit. Microphthalmia may involve one or both eyes. It may occur in isolation with no associated...
  9. Microphthalmia syndrome, Lenz Microphthalmia syndrome, Lenz
    Microphthalmia syndrome, Lenz: See: Lenz microphthalmia syndrome....
  10. Micropigmentation Micropigmentation
    Micropigmentation: Tattooing....
  11. Microscope Microscope
    Microscope: An optical instrument that augments the power of the eye to see small objects. The name microscope was coined by Johannes Faber (1574-1629) who in 1628 borrowed from the Greek to combined micro-, small with skopein, to view. Although the first microscopes were simple microscopes, most (i...
  12. Microscope, compound Microscope, compound
    Microscope, compound: A microscope that consists of two microscopes in series, the first serving as the ocular lens (close to the eye) and the second serving as the objective lens (close to the object to be viewed). Credit for creating the compound microscope goes usually to the Dutch spectaclemaker...
  13. Microscope, electron Microscope, electron
    Microscope, electron: See: Electron microscope....
  14. Microscope, fluorescent Microscope, fluorescent
    Microscope, fluorescent: See: Fluorescent microscope....
  15. Microscope, simple Microscope, simple
    Microscope, simple: A microscope that has a single converging lens (or a combination of lenses that function optically as a single converging lens). Anton van Leeuwenhoek (1632-1723) made good use of the simple microscope to look at the life within a drop of water, and such. The magnifying propertie...