| MA | malignant arrhythmia; management and administration; mandelic acid; masseter; Master of Arts; matern... |
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| MJT | Mead Johnson tube |
| NET | nasoendotracheal tube; nerve excitability test; neuroectodermal tumor; neuroendocrine tumor; norepin... |
| NGT | nasogastric tube; nominal group technique; normal glucose tolerance |
| NTD | neural tube defect; nitroblue tetrazolium dye; noise tone difference; 5'-nucleotidase |
| leach tube | A reusable cone-shaped plastic container used for growing seedlings for revegetation work, the containers can be mounted in a rack for easy transport and were named after Ray Leach, who invented them in Oregon. (09 Oct 1997) |
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| Levin tube | A tube introduced through the nose into the upper alimentary canal, to facilitate intestinal decompression. (05 Mar 2000) |