Perpendicular



GRE TOEFL

解释

GRE 红宝书

• adj. 垂直的
• ［英］ adj. 垂直的 ( exactly upright, vertical)
• ［记］ per ( 全部) ＋pend ( 挂) ＋icular -> 全部挂的状态 -> 垂直的
• ［例］ Any two adjacent sides of a square are perpendicular.

Webster Collegiate

I. adjective

• Etymology: Middle English perpendiculer, from Middle French, from Latin perpendicularis, from perpendiculum plumb line, from per- + pendēre to hang — more at pendant
• Date: 14th century
• 1.
  • a. standing at right angles to the plane of the horizon ; exactly upright
  • b. being at right angles to a given line or plane
• 2. extremely steep ; precipitous
• 3. often capitalized of or relating to a medieval English Gothic style of architecture in which vertical lines predominate
• 4. relating to, uniting, or consisting of individuals of dissimilar type or on different levels
• Synonyms: see vertical
• ? perpendicularity noun
• ? perpendicularly adverb

II. noun

• Date: 1571
• a line at right angles to a line or plane (as of the horizon)

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