perpendicular

• adj.垂直、直交; 直立; 急斜面
• n. 垂直線; 垂直位置

per-, entire, -pend, suspended, 語源的にはdepend, pendulumと同じ。

perpendicular

perpendicular: see pendulum

perpendicular (adj.)

late 15c., from adverb (late 14c.), from Old French perpendiculer, from Latin perpendicularis "vertical, as a plumb line," from perpendiculum "plumb line," from perpendere "balance carefully," from per- "thoroughly" (see per) + pendere "to weigh, to hang" (see pendant). As a noun from 1570s. Related: Perpendicularly; perpendicularity.

1. The left wing dipped until it was perpendicular to the ground.

左翼は地面と90度の角度になるまで垂れ下がった。dd>

2.Are the lines perpendicular to each other？

これらの直線は互いに垂直ですか？

3.The two lines of bones are set perpendicular to one another.

この2つの骨は互いに垂直である。

4.The plumbline is always perpendicular to the horizontal plane.

鉛直線は常に水平面に垂直である。

5.Let AB be perpendicular to CD.

ABがCDに垂直であるとする。