vertex
Word family nounvertexverticity
ver·tex /ˈvɜːteks $ ˈvɜːr-/ noun (plural vertices /-təsiːz/ or vertexes) [countableC] technical HMCFthe point where two lines meet to form an angle, especially the point of a triangle 〔两线相交成角时的〕交点;〔尤指三角形的〕顶点 Origin vertex (1500-1600) Latin vertex,
vortex “turning movement, whirlpool, top of the head, top”, from
vertere;
→ VERSE