nucleus nucleus /ˈnuːkliːəs/

noun

1. () A part of the cell containing DNA and RNA and responsible for growth and reproduction  ( cell nucleus , karyon , nucleus )
   a part of the cell containing DNA and RNA and responsible for growth and reproduction
     The nucleus contains the genetic material and controls the activities of the cell.
   The nucleus contains the genetic material and controls the activities of the cell.
   
2. () A small group of indispensable persons or things  ( core group , nucleus , core )
   a small group of indispensable persons or things
    Five periodicals make up the core of their publishing program
   five periodicals make up the core of their publishing program
   
   
3. () The positively charged dense center of an atom  ( nucleus )
   the positively charged dense center of an atom
     Within the cell, the nucleus contained the genetic information that governed its functions.
   Within the cell, the nucleus contained the genetic information that governed its functions.
   
4. The central structure of the lens that is surrounded by the cortex  ( lens nucleus , nucleus )
   the central structure of the lens that is surrounded by the cortex
   
5. Any histologically identifiable mass of neural cell bodies in the brain or spinal cord  ( nucleus )
   any histologically identifiable mass of neural cell bodies in the brain or spinal cord
   
6. (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail  ( nucleus )
   (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail
   

 Douglas MacArthur Douglas MacArthur /ˈdʌɡləs məkˈɑːrθər/

noun

1. United States general who served as chief of staff and commanded Allied forces in the South Pacific during World War II; he accepted the surrender of Japan (1880-1964)  ( Douglas MacArthur , MacArthur )
   United States general who served as chief of staff and commanded Allied forces in the South Pacific during World War II; he accepted the surrender of Japan (1880-1964)
   
   

 hectograph hectograph /ˈhɛktəˌgræf/

noun

1. Duplicator consisting of a gelatin plate from which ink can be taken to make a copy  ( hectograph , heliotype )
   duplicator consisting of a gelatin plate from which ink can be taken to make a copy
   
   

verb

1. Copy on a duplicator  ( hectograph )
   copy on a duplicator
    Hectograph the hand-outs
   hectograph the hand-outs
   

 autoclave autoclave /ˈɔtoʊˌkleɪv/

noun

1. A device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments  ( autoclave , steriliser [British] , sterilizer )
   a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments
   
   

verb

1. Subject to the action of an autoclave  ( autoclave )
   subject to the action of an autoclave