recuperator

noun
re·​cu·​per·​a·​tor | \ -ˌrātə(r)\
plural -ssee sense 2

Definition of recuperator

1 : one that recuperates
2 also plural recuperatores \ ⸗ˌ⸗pərəˈtōr(ˌ)ēz \ : a judge in ancient Rome originally appointed to hear cases involving foreigners
4 : a device for returning a gun into the firing position after recoil

History and Etymology for recuperator

Latin, literally, recoverer, from recuperatus + -or

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