Longman Dictionary of Contemporary English homepage

Topic: MATHS

Date: 1500-1600
Language: Latin
Origin: vertex, vortex 'turning movement, whirlpool, top of the head, top', from vertere; VERSE

vertex

noun
     
ver‧tex plural vertices or vertexes [countable] technical
HM the point where two lines meet to form an angle, especially the point of a triangle
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