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submersible , submergible 
  adj 
1 able to be submerged 
2 capable of operating under water, etc. 
  n 
3 a vessel designed to operate under water for short periods 
4 a submarine taking one or more men that is designed and equipped to carry out work in deep water below the levels at which divers can work 
 submersibility, submergibility  n 

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