atomic number 12 atomic number 12 /əˈtɒmɪk ˈnʌmbər ˌtwɛlv/

noun

1. A light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)  ( atomic number 12 , magnesium , Mg )
   a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
    The magnesium supplement was known to help with muscle relaxation and sleep
   The magnesium supplement was known to help with muscle relaxation and sleep
   
   

 harum-scarum harum-scarum /ˈhærəmˈskærəm/

adjective

1. Cheerfully irresponsible  ( carefree , devil-may-care , freewheeling , happy-go-lucky , harum-scarum , slaphappy [Informal] )
   cheerfully irresponsible
    Carefree with his money
   carefree with his money
    Freewheeling urban youths
   freewheeling urban youths
    Had a harum-scarum youth
   had a harum-scarum youth
   

adverb

1. In a wild or reckless manner  ( harum-scarum , pell-mell )
   in a wild or reckless manner
    Dashing harum-scarum all over the place
   dashing harum-scarum all over the place
    Running pell-mell up the stairs
   running pell-mell up the stairs
   

noun

1. A reckless impetuous irresponsible person  ( daredevil , harum-scarum , hothead , lunatic , madcap , swashbuckler )
   a reckless impetuous irresponsible person
   
   

 sash lock sash lock /sæʃ lɒk/

noun

1. A lock attached to the sashes of a double hung window that can fix both in the shut position  ( sash fastener , sash lock , window lock )
   a lock attached to the sashes of a double hung window that can fix both in the shut position
   
   

 nonsmoker nonsmoker /nɑːnˈsmoʊkɝ/

noun

1. A passenger car for passengers who want to avoid tobacco smoke  ( nonsmoker , nonsmoking car )
   a passenger car for passengers who want to avoid tobacco smoke
   
   
2. A person who does not smoke tobacco  ( nonsmoker )
   a person who does not smoke tobacco