plessimeter

/plɛˈsɪmɪtər/
noun
  1. A small, flat plate used in medical percussion to help listen to sounds from inside the body.
    • Using a plessimeter helps produce a clearer sound during a physical exam.
    • The doctor placed a plessimeter on the patient's chest before tapping it gently.
    • Modern doctors sometimes use a finger as a plessimeter instead of a metal plate.
Synonyms
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