An Etymological Dictionary of Astronomy and Astrophysics
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Of or pertaining to a state, value, or quantity that is less than critical, especially the condition of a → subcritical reactor.

→ sub-; → critical.

An amount of → fissile material that by its mass or geometry is incapable of sustaining a → fission → chain reaction.

→ subcritical; → mass.

A → nuclear reactor in which the rate of production of → fission neutrons is lower than the rate of production in the previous generation, and therefore the number of fissions decreases over time.

→ subcritical; → reactor.