subcritical


sub·crit·i·cal

adjective \-ˈkri-ti-kəl\

Definition of SUBCRITICAL

1
:  less or lower than critical in respect to a specified factor
2
a :  of insufficient size to sustain a chain reaction <a subcritical mass of fissionable material>
b :  designed for use with fissionable material of subcritical mass <a subcritical reactor>

First Known Use of SUBCRITICAL

1930

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