Pa

Definitions of Pa
  1. noun
    a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
    synonyms: atomic number 91, protactinium, protoactinium
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    type of:
    metal, metallic element
    any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
  2. noun
    a unit of pressure equal to one newton per square meter
    synonyms: pascal
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    type of:
    pressure unit
    a unit measuring force per unit area
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