Definition of STM

1 [ New Latin sacrae theologiae magister ] master of sacred theology
2 scanning tunneling microscope; scanning tunneling microscopy

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Medical Definition of STM

short-term memory STM, then, is labile, and in the normal course of events, decays over a period of minutes to hours. If the item to be recalled is not, over this period, transferred from STM to LTM, it is irretrievably lost as STM decays. — Steven Rose, in The Oxford Companion to the Mind, 1989