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Adjective: biconcave  ,bI,kón'keyv or bI'kón,keyv
  1. Concave on both sides
    "The biconcave or negative lens produces upright, virtual images of originals which are beyond the principal plane";
    - concavo-concave

See also: concave

Encyclopedia: Biconcave

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bicker
bickerer
bickering
bicky
bicolor
bicolor lespediza
bicolored
bicolour
bicolour lespediza
bicoloured
biconcave
biconvex
bicorn
bicornate
bicorne
bicorned
bicornuate
bicornuous
bicultural
bicuspid
bicuspid valve