Split into two distinct parts.

A bifid rib is a congenital abnormality of the rib cage and associated muscles and nerves which occurs in about 1.2% of humans.

A bifid penis (or double penis) is a rare congenital defect where two genital tubercles develop.

(cryptography) A classical cipher that combines the Polybius square with transposition, and uses fractionation to achieve diffusion.