To act as a catalyst.
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cat·a·lyze or Brit cat·a·lyse 'kat-əl-.īz vt, -lyzed or Brit -lysed; -lyz·ing or Brit -lys·ing to bring about the catalysis of (a chemical reaction)
cat·a·lyz·er or Brit cat·a·lys·er n
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cat·a·lyze (katґə-līz) to cause or produce catalysis.Medical dictionary. 2011.