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TOEFL BNC: 21027 COCA: 20157

concave

Word family 
Related topics: Technology
ldoce_049_ccon·cave /ˌkɒnˈkeɪv◂, kən- $ ˌkɑːnˈkeɪv◂, kən-/ adjectiveadj  
TBENDa concave surface is curved inwards in the middle 凹的，凹面的 OPP convex
 a concave lens
凹透镜
→5  See picture of concave 凹, convex 凸
Examples from the Corpus
concave• The concave feels good, similar to the Gator but deeper if anything, simple but functional.• Modern lizards and crocodiles have saddle-shaped shoulder joints, concave from the bottom to the top and convex from the inside out.• The cone would then float up into the concave funnel and constrict the water passage, thus throttling its flow.• Most myopic children can be fitted with glasses with concave lenses which will bring their vision to normal.• a concave mirror• At the centre of the face was a concave portion and Nuadu knew that the jutting bone of the nose had gone.• The face was in inverse relief, with the features concave rather than convex, as for a mold.• Disc harrows consisting of gangs of concave steel discs are dragged at an angle to the line of draught.• The tail is quite mellow, and concave too.
Origin concave
(1500-1600) Latin concavus, from com- ( → COM-) + cavus “hollow”
con·cave adjectiveadj
Chinese
Syllable
Corpus
TOEFL BNC: 21027 COCA: 20157
TOEFL BNC: 21027 COCA: 20157
concave adj.
⇨ curved
TOEFL BNC: 21027 COCA: 20157

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