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Adjective: biconcave  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

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