apparatus apparatus /ˌæpɝˈætəs/

noun

1. () Equipment designed to serve a specific function  ( setup , apparatus )
   equipment designed to serve a specific function
     The scientific apparatus was used to measure the temperature of the liquid.
   The scientific apparatus was used to measure the temperature of the liquid.
   
   
2. (anatomy) a group of body parts that work together to perform a given function  ( apparatus )
   (anatomy) a group of body parts that work together to perform a given function
    The breathing apparatus
   the breathing apparatus