| mastoid part of temporal bone |
the posterior portion of the pars petrosa ossis temporalis, bounded anteriorly by the external acoustic meatus and articulating superiorly with the parietal bone and posteriorly with the occipital bone. Called also mastoid bone.
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| masked virus |
a virus which ordinarily occurs in a noninfective state and is demonstrable by indirect methods which activate it, as by blind passage in experimental animals.
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| mass reflex |
in severe injury of the spinal cord, stimulation below the level of the lesion produces flexion reflexes of the lower extremity, evacuation of the bowels and bladder, and sweating of the skin below the level of the lesion. Called also Riddoch's mass r.
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| mass absorption coefficient |
in radiology, the linear absorption coefficient divided by the density of the absorber.
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| mass attenuation coefficient |
the linear attenuation coefficient divided by the density of the absorbing material.
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