ଅର୍ଥ : Any substance used to slow down neutrons in nuclear reactors.

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

ଅର୍ଥ : Someone who presides over a forum or debate.

ଅର୍ଥ : Someone who mediates disputes and attempts to avoid violence.