/'mɒdəreɪtə(r); `mɑdə,retɚ/
n
1 person who arbitrates in a dispute; mediator 仲裁人; 调解人.
2 person who makes sure that the same standards areused by different examiners when marking an examination 评分监督（统一各主考人评分标准者）.
3 Presbyterian minister presiding over a church court 长老会教会法庭上的主持者.
4 (physics 物) substance in which neutrons are slowed down in a nuclear reactor 减速剂, 慢化剂（核反应堆中使中子减速的物质）.

n[C]
someone whose job is to control a discussion or an argument between people
BrE someone who makes sure that an examination is fair, and that the marks given are fair and correct
a religious leader who is in charge of the council of the Presbyterian and United Reformed Churches