鉛えん直ちょく線せん

え

ん

ちょ

く

せ

ん

Meanings

1

Technical term in geometry, physics, and engineering for a line that is exactly vertical, often defined by gravity or a plumb bob.

せん

と

いう

。

A line at a right angle to a vertical line is called a horizontal line.

建たて物ものの傾かたむきを測はかるために鉛えん直ちょく線せんを引ひく。

Draw a vertical line to measure the tilt of the building.