垂直線 すいちょくせん Meanings Noun perpendicular line; vertical line Kanji 垂 dangle. Read as スイ. 直 straight. Read as チョク. 線 line. Read as セン. Example sentences 厳密に言えば、それは垂直線ではなかった。Strictly speaking, it was not a vertical line. Jinuma: Japanese Dictionary · Word lists