子午圈，是指地平坐标系或赤道坐标系中的大圆，即在地平坐标系中经过北天极的地平经圈，或在赤道坐标系中经过天顶的赤经圈。它是地平坐标系和第一赤道坐标系中的主圈。子午圈是天球上经过北天极、天顶、南点、南天极、天底和北点的，并与天球相交的大圆。天体运动经过子午圈称为中天。
为提高国内载重子午胎的质量水平，设计了一条胎圈用扁钢丝生产线。
To improve the level of domestic loading meridian tyre quality, a flat bead wire line is designed.
分析全钢载重子午线轮胎胎冠、胎侧、胎肩和胎圈部位外观明疤的产生原因，并提出解决措施。
The causes for the appearance defects on crown, shoulder and bead areas of BTR tire were analyzed and their countermeasures were proposed.
试验研究防焦剂CTP减量对轿车子午线轮胎胎圈护胶喷霜的影响。
The influence of anti-scorching agent CTP on blooming from bead chafer of PCR tire was experimentally investigated.
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