Bifid Alphabet Bi·Fid Adjective  Latin  Bi  Divided Equal

bi·fid
 \\ˈbī-ˌfid, -fəd\\ adjective: divided into two equal lobes or parts by a median cleft
    a bifid leaf

bi·fid
\ˈbīˌfid, -_fə̇d\ adjective
Etymology: Latin bifidus, from bi- bi- (I) + -fidus (from the stem of Latin findere to split) — more at 
1. : divided into two equal lobes or parts by a median cleft
 < a bifid leaf >
 < claws bifid >
2. of a cipher alphabet : constructed by matching the letters of the alphabet with 2-unit equivalents of such a nature that exactly as many of them can be constructed as there are letters of the alphabet (as by using the 25 possible pairs made up of combinations of one or more of the numerals 1,2,3,4, and 5 for a 25-letter alphabet) — compare 
• bi·fid·i·ty \bīˈfidə̇d.ē\ noun -es
• bi·fid·ly adverb