clamshell
adjective /ˈklæmʃel/
  /ˈklæmʃel/
[only before noun]- having a cover or other part that opens and shuts like the shell of a clam蛤壳式的;掀盖式的 - a clamshell phone翻盖式手机 
 Collocations DictionaryClamshell is used with these nouns:- phone
 
- a clamshell phone