downtown downtown /ˈdaʊnˈtaʊn/

adjective

1. () [ N. American] Of or located in the lower part of a town, or in the business center  ( downtown [ N. American] )
   of or located in the lower part of a town, or in the business center
    Downtown Manhattan
   downtown Manhattan
    Delinquents roaming the downtown streets
   delinquents roaming the downtown streets
   

adverb

1. [ N. American] Toward or in the lower or central part of town  ( downtown [ N. American] )
   toward or in the lower or central part of town
   

noun

1. () [ N. American] The central area or commercial center of a town or city  ( business district , downtown [ N. American] )
   the central area or commercial center of a town or city
    The heart of Birmingham's downtown
   the heart of Birmingham's downtown
   
   

 blackmouth bass blackmouth bass /ˈblækmaʊθ bæs/

noun

1. Small marine fish with black mouth and gill cavity  ( blackmouth bass , Synagrops bellus )
   small marine fish with black mouth and gill cavity
   
   

 immunochemical assay immunochemical assay /ˌɪmjunoʊˈkɛmɪkəl əˈseɪ/

noun

1. Identification of a substance (especially a protein) by its action as an antigen  ( immunoassay , immunochemical assay )
   identification of a substance (especially a protein) by its action as an antigen
    PSA in the blood can be measured with an immunochemical assay
   PSA in the blood can be measured with an immunochemical assay
   
   

 Sir Harold George Nicolson Sir Harold George Nicolson /sɜːr ˈhærəld dʒɔːrdʒ ˈnɪkəlsən/

noun

1. English diplomat and author (1886-1968)  ( Harold Nicolson , Nicolson , Sir Harold George Nicolson )
   English diplomat and author (1886-1968)