chalkboard chalkboard /ˈtʃɔːkbɔːrd/

noun

1. [ N. American] Sheet of slate; for writing with chalk  ( chalkboard [ N. American] , blackboard )
   sheet of slate; for writing with chalk
    The teacher wrote down the important points on the blackboard so that we could all copy them in our notebooks
   The teacher wrote down the important points on the blackboard so that we could all copy them in our notebooks
   
   

 laughing gull laughing gull /ˈlɑːfɪŋ gʌl/

noun

1. Small black-headed European gull  ( blackcap , Larus ridibundus , laughing gull , pewit , pewit gull )
   small black-headed European gull
   
   

 swab swab /ˈswɑːb/

noun

1. Cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors  ( mop , swab , swob )
   cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors
    I mop the floor in the utility room with a mop
   I mop the floor in the utility room with a mop
   
   
2. Implement consisting of a small piece of cotton that is used to apply medication or cleanse a wound or obtain a specimen of a secretion  ( swab )
   implement consisting of a small piece of cotton that is used to apply medication or cleanse a wound or obtain a specimen of a secretion
    The nurse used a swab to clean the wound before applying a bandage.
   The nurse used a swab to clean the wound before applying a bandage.
   
   

verb

1. () Wash with a swab or a mop  ( swob , swab )
   wash with a swab or a mop
    Swab the ship's decks
   swab the ship's decks
   
2. Apply (usually a liquid) to a surface  ( swab , swob , dab )
   apply (usually a liquid) to a surface
    Dab the wall with paint
   dab the wall with paint
   

 printed circuit printed circuit /ˈprɪntɪd ˈsɝːkɪt/

noun

1. Computer circuit consisting of an electronic sub-assembly; copper conductors are laminated on an insulating board or card and circuit components are inserted into holes and dip soldered  ( printed circuit )
   computer circuit consisting of an electronic sub-assembly; copper conductors are laminated on an insulating board or card and circuit components are inserted into holes and dip soldered
    The technician carefully examined the printed circuit for any defects.
   The technician carefully examined the printed circuit for any defects.