cell wall cell wall /sɛl wɔːl/

noun

1. A rigid layer of polysaccharides enclosing the membrane of plant and prokaryotic cells; maintains the shape of the cell and serves as a protective barrier  ( cell wall )
   a rigid layer of polysaccharides enclosing the membrane of plant and prokaryotic cells; maintains the shape of the cell and serves as a protective barrier
    The cell wall provides support and protection to plant cells.
   The cell wall provides support and protection to plant cells.
   
   

 laminar flow clean room laminar flow clean room /ləˈmiːnər floʊ kliːn ruːm/

noun

1. A clean room free of all extraneous particles; used in fabricating microprocessors  ( laminar flow clean room )
   a clean room free of all extraneous particles; used in fabricating microprocessors
    The microchips were produced in a laminar flow clean room to prevent contamination.
   The microchips were produced in a laminar flow clean room to prevent contamination.
   
   

 fraud fraud /ˈfrɔd/

noun

1. () Intentional deception resulting in injury to another person  ( fraud )
   intentional deception resulting in injury to another person
     The businessman was arrested for committing financial fraud.
   The businessman was arrested for committing financial fraud.
   
2. () Something intended to deceive; deliberate trickery intended to gain an advantage  ( dupery , fraudulence , hoax , fraud , humbug , put-on [Informal, N. American] )
   something intended to deceive; deliberate trickery intended to gain an advantage
    The businessman was arrested for committing a major financial fraud.
   The businessman was arrested for committing a major financial fraud.
   
   
3. () A person who makes deceitful pretenses  ( fake , imposter , impostor , pretender , pseud , pseudo , role player , sham , shammer , faker , fraud )
   a person who makes deceitful pretenses
   

 preface preface /ˈprɛfəs/

noun

1. () A short introductory essay preceding the text of a book  ( foreword , prolusion , preface )
   a short introductory essay preceding the text of a book
   
   

verb

1. () Furnish with a preface or introduction  ( introduce , precede , premise , preface )
   furnish with a preface or introduction
    She always precedes her lectures with a joke
   She always precedes her lectures with a joke
    He prefaced his lecture with a critical remark about the institution
   He prefaced his lecture with a critical remark about the institution