Bifluoride
an acid salt of hydrofluoric acid containing the group hf 2 -, as ammonium bifluoride, nh 4 hf 2.
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- Bifocal  
chiefly optics. having two foci. (of an eyegl-ss or contact lens) having two portions, one for near and one for far vision. bifocals, bifocal eyegl-sses or contact lenses. historical examples encyclopaedia britannica, 11th edition, volume 11, slice 1 “franciscans” to “french language” various parallel paths thomas william rolleston adjective (optics) having two different focuses relating […]
 - Bifold  
capable of being folded into two parts, as with leaves that are hinged together: a bifold door; bifold shutters. historical examples hints on cheese-making thomas day curtis
 - Bifoliate  
having two leaves. adjective having only two leaves adj.
 - Bifoliolate  
having two leaflets. adjective (of compound leaves) consisting of two leaflets
 - Biform  
having or combining two forms, as a centaur or mermaid. historical examples the genus pinus george russell shaw adjective having or combining the characteristics of two forms, as a centaur
 
