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Moderator (Noun)

Any substance used to slow down neutrons in nuclear reactors.

Nouns denoting substances.

Graphite is a popular moderator material used in many nuclear reactors to slow down neutrons.
The reactor's moderator system was designed to efficiently cool the fuel rods and prevent overheating.
In pressurized heavy water reactors, the moderator is actually the heavy water that surrounds the fuel rods.
The choice of moderator is crucial in nuclear reactor design, as it can affect the reactor's efficiency and safety.
Lithium hydride has been proposed as a potential moderator material for some advanced reactor designs due to its high neutron scattering cross-section.

In the Presbyterian church, the officer who presides over a synod or general assembly.

Nouns denoting people.

The moderator of the general assembly delivered the keynote address on the first day of the conference.
The moderator's role was to facilitate discussion and ensure that all voices were heard during the synod.
She was elected moderator of the presbytery for a three-year term, during which she oversaw several major initiatives.
The moderator's opening prayer set the tone for the rest of the assembly, calling for unity and discernment.
As moderator, he was responsible for appointing committees and overseeing the business of the synod.