perpendicular noun - Definition, pictures, pronunciation and usage
https://www.oxfordlearnersdictionaries.com/us/definition/english/perpendicular_2
WEBnoun. /ˌpɜːpənˈdɪkjələ (r)/ /ˌpɜːrpənˈdɪkjələr/ the perpendicular. [singular] a line, position or direction that is exactly perpendicular. The wall is a little out of the perpendicular. Word Origin. Questions about grammar and vocabulary? Find the answers with Practical English Usage online, your indispensable guide to problems in English.
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