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Mach number

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{n: Mach number} the ratio of the speed of a moving body to the speed of sound

{n: Mach, Ernst Mach} Austrian physicist and philosopher who introduced the Mach number and who founded logical positivism (1838-1916)

{n: apoptosis, programmed cell death, caspase-mediated cell death} a type of cell death in which the cell uses specialized cellular machinery to kill itself; a cell suicide mechanism that enables metazoans to control cell number and eliminate cells that threaten the animal's survival

{n: thulium, Tm, atomic number 69} a soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime

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