major diameter

基本解释

Plain Ring and Snap Gages for checking the major diameter.
普通环规与卡规是为了检测大径。
This paper introduces the design principle, structure and application effect of the major diameter core sample cutting machine.
文中介绍了大直径岩样切割机的设计原理、结构及使用效果。
Transformation from structural reservoir to lithologic reservoir has been realized in oil field exploration, so major diameter core analysis technique is widely used in reservoir property analysis.
油田勘探已实现由构造油藏勘探到岩性油藏勘探的转变，大直径岩心分析技术被广泛应用于储层物性分析工作中。

One approach might be to say that in order to be considered a major planet, a body needs to be larger than a certain diameter.
ECONOMIST: Pluto out in the cold