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convex

adjective
 
 
/ˈkɒn.veks/ US  /ˈkɑːn-/ /kənˈveks/

Definition

curved or swelling out: a convex lens/mirror → Compare concaveProperties of circles and curves
(Definition of convex adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of convex