/ ˈvɜːteks; NAmE ˈvɜːrt-/ noun ( pl. ver·ti·ces / -tɪsiːz; NAmE / or ver·texes )
1.
( geometry ) a point where two lines meet to form an angle, especially the point of a triangle or cone opposite the base
2.
( technical ) the highest point or top of sth
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WORD ORIGIN
late Middle English : from Latin , whirlpool, crown of a head, vertex , from vertere to turn.