| m-chloral | A polymer of chloral obtained by prolonged contact with sulfuric acid; it has properties similar to those of chloral hydrate. Synonym: metachloral, p-chloral, trichloral. (05 Mar 2000) |
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| m-cone | Middle wavelength sensitive c. (green c.). (05 Mar 2000) |
| m-cresol | A local antiseptic with a higher germicidal power than phenol and less toxicity to tissues; used in disinfectants and fumigants; its acetate derivative is used as a topical antiseptic and fungicide. Synonym: metacresol. (05 Mar 2000) |
| M-CSF | macrophage-colony-stimulating factor |
| M-mode | A diagnostic ultrasound presentation of the temporal changes in echoes in which the depth of echo-producing interfaces is displayed along one axis with time (T) along the second axis; motion (M) of the interfaces toward and away from the transducer is displayed. Synonym: TM-mode. (05 Mar 2000) |
| M-protease | <enzyme> Highly alkaline resistant subtilisin-family serine protease from bacillus. Registry number: EC 3.4.21.- (26 Jun 1999) |