vitrification vitrification /ˌvɪtrɪfɪˈkeɪʃən/

noun

1. The process of becoming vitreous  ( vitrification )
   the process of becoming vitreous
    The ancient pottery underwent vitrification, giving it a glass-like finish.
   The ancient pottery underwent vitrification, giving it a glass-like finish.
   
   
2. A vitrified substance; the glassy result of being vitrified  ( vitrification )
   a vitrified substance; the glassy result of being vitrified
    The process of vitrification turns certain materials into a glass-like substance.
   The process of vitrification turns certain materials into a glass-like substance.
   
   

 negro negro /ˈniːgroʊ/

adjective

1. () Having skin rich in melanin pigments  ( coloured , negro , colored )
   having skin rich in melanin pigments
   

 Negro

noun

1. () A person with African ancestry,  ( African-American , Black , Negroid , Negro )
   a person with African ancestry,
    Negro
   Negro
    Negroid
   Negroid
   
   

 Didion Didion /ˈdɪdiːən/

noun

1. United States writer (born in 1934)  ( Didion , Joan Didion )
   United States writer (born in 1934)
   
   

 guardrail guardrail /ˈgɑːrˌdreɪl/

noun

1. A railing placed alongside a stairway or road for safety  ( guardrail , safety rail )
   a railing placed alongside a stairway or road for safety