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'Perpendicular' means standing straight up and down, or meeting another line at a perfect right angle (90 degrees), like the way a wall meets the floor. It's a common word in math and building, used whenever two lines or surfaces cross exactly straight, not at a slant.
垂直的、成直角的（常用於數學與建築）。
組成per- (thoroughly) + pendere (to hang) + -icular. It comes from Latin 'perpendiculum,' a weight hung on a string to check that something stands perfectly straight up — what we now call a plumb line.
原始詞典資料7 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
Perpendicularadj
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architectureOf a style of English Gothic architecture from the fourteenth and fifteenth centuries, marked by stiff and rectilinear lines, mostly vertical window-tracery, depressed or four-centre arch, fan-tracery vaulting, and panelled walls.
perpendicularadj/ˌpɜː.pənˈdɪk.jə.lə(ɹ)/
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geometrymathematicssciencesAt or forming a right angle (to something).
- In most houses, the walls are perpendicular to the floor.
- A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. Applying a force tangential to the knob is essentially equivalent to applying one perpendicular to a radial line defining the lever.
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Exactly upright; extending in a straight line toward the centre of the earth, etc.
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Independent of or irrelevant to each other; orthogonal.
- Hey, I'm not unsabotaging anything! This is completely perpendicular sabotage!
perpendicularnoun/ˌpɜː.pənˈdɪk.jə.lə(ɹ)/
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geometrymathematicssciencesA line or plane that is perpendicular to another.
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A device such as a plumb line that is used in making or marking a perpendicular line.
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obsoleteslangA meal eaten at a tavern bar while standing up.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。