“- noun
Usage: capitalized 1st B
Etymology: after Francis Bacon, who proposed it
: a cipher that hides a message in a cover text by representing the letters of the plaintext by different combinations of two letter forms (as italic and roman) in each sequence of five letters of the cover text (as when “Spr in gfie l d, Ma s s” hides the word CAB by the code xxxx x=A, xxxx x=B, xxx xx =C)