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plural hypervisors
(computing) A firmware or software system that provides a virtual machine and allows it to operate directly on underlying hardware (instead of via emulation), but within specified constraints. quotations examples
The hypervisor is the component that translates the virtual machines into the underlying hardware. There are two types of hypervisors: The type 1 hypervisor runs directly on the host hardware; the type 2 or hosted hypervisor runs in software.
2011, Edward Whalen, Oracle VM Implementation and Administration Guide, McGraw Hill Professional, page 17