nuclear chemist nuclear chemist /ˈnjuːkliər ˈkɛmɪst/

noun

1. A chemist who specializes in nuclear chemistry  ( nuclear chemist , radiochemist )
   a chemist who specializes in nuclear chemistry
   
   

 double-hung window double-hung window /ˈdʌbəlˈhʌŋ ˈwɪndoʊ/

noun

1. A window having two sashes that slide up and down  ( double-hung window )
   a window having two sashes that slide up and down
    I love the double-hung window in my room because it provides excellent ventilation.
   I love the double-hung window in my room because it provides excellent ventilation.
   
   

 heavy weapon heavy weapon /ˈhɛvi ˈwɛpən/

noun

1. Large but transportable armament  ( heavy weapon , ordnance , artillery , gun )
   large but transportable armament
     The artillery fired rounds into the enemy's territory.
   The artillery fired rounds into the enemy's territory.
   
   

 authoritarian authoritarian /əˌθɔrəˈtɛriːən/

adjective

1. () Characteristic of an absolute ruler or absolute rule; having absolute sovereignty  ( autocratic , despotic , dictatorial , authoritarian , tyrannic , tyrannical )
   characteristic of an absolute ruler or absolute rule; having absolute sovereignty
    An authoritarian regime
   an authoritarian regime
    Autocratic government
   autocratic government
    Despotic rulers
   despotic rulers
    A dictatorial rule that lasted for the duration of the war
   a dictatorial rule that lasted for the duration of the war
    A tyrannical government
   a tyrannical government
   
2. Expecting unquestioning obedience  ( authoritarian , dictatorial , overbearing )
   expecting unquestioning obedience
    The timid child of authoritarian parents
   the timid child of authoritarian parents
    Insufferably overbearing behavior toward the waiter
   insufferably overbearing behavior toward the waiter
   

noun

1. A person who behaves in a tyrannical manner  ( authoritarian , dictator )
   a person who behaves in a tyrannical manner
    My boss is a dictator who makes everyone work overtime
   my boss is a dictator who makes everyone work overtime