Online Google Dictionary

so-called wordnet sense
Adjective
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Used to show that something or someone is commonly designated by the name or term specified,
  1. Used to show that something or someone is commonly designated by the name or term specified
    • - next on the list are so-called “soft” chemicals like phosphorous acid
  2. Used to express one's view that such a name or term is inappropriate
    • - she could trust him more than any of her so-called friends