retrovirus retrovirus /ˌrɛtroʊˈvaɪrəs/

noun

1. Any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell  ( retrovirus )
   any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell
   
   

 Trent Trent /ˈtrɛnt/

noun

1. A city in northern Italy (northwest of Venice) on the River Adige; the site of the Council of Trent  ( Trent , Trento )
   a city in northern Italy (northwest of Venice) on the River Adige; the site of the Council of Trent
   
   
2. A river in central England that flows generally northeastward to join with the Ouse River and form the Humber  ( River Trent , Trent , Trent River )
   a river in central England that flows generally northeastward to join with the Ouse River and form the Humber
   
   

 Mary Godwin Wollstonecraft Shelley Mary Godwin Wollstonecraft Shelley /ˈmɛri ˈɡɑːdwɪn ˈwʊlstənkræft ˈʃɛli/

noun

1. English writer who created Frankenstein's monster and married Percy Bysshe Shelley (1797-1851)  ( Mary Godwin Wollstonecraft Shelley , Mary Shelley , Mary Wollstonecraft Shelley , Shelley )
   English writer who created Frankenstein's monster and married Percy Bysshe Shelley (1797-1851)
   
   

 contralto contralto /kənˈtræltoʊ/

adjective

1. Of or being the lowest female voice  ( alto , contralto )
   of or being the lowest female voice
   

noun

1. () A woman singer having a contralto voice  ( contralto )
   a woman singer having a contralto voice
    The orchestra was accompanied by a talented contralto who performed several solo pieces.
   The orchestra was accompanied by a talented contralto who performed several solo pieces.
   
   
2. The lowest female singing voice  ( alto , contralto )
   the lowest female singing voice