| machine, heart-lung | A machine that does the work both of the heart (pump blood) and the lungs (oxygenate the blood). Used, for example, in open heart surgery. Blood returning to the heart is diverted through the machine before returning it to the arterial circulation. Also called a pump-oxygenator. (12 Dec 1998) |
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| machinery murmur | The long "continuous" rumbling murmur of patent ductus arteriosus. (05 Mar 2000) |
| macho | <zoology> The striped mullet of California (Mugil cephalus, or Mexicanus). Origin: Sp. Source: Websters Dictionary (01 Mar 1998) |
| Machupo virus | <virology> A member of the Arenaviridae that may cause a severe haemorrhagic fever in humans. The natural hosts are rodents and transmission from human to human is not common. (18 Nov 1997) |