#1 PM n. [autopsy, necropsy, postmortem, post-mortem, postmortem examination, post-mortem examination] an examination and dissection of a dead body to determine cause of death or the changes produced by disease. wn
#2 PM n. [promethium, Pm, atomic number 61] a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium. wn
#3 PM n. [Prime Minister, premier] the person who holds the position of head of the government in the United Kingdom. wn
#4 PM n. [phase modulation] modulation of the phase of the carrier wave. wn
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