dimidiate

adj

1. (not-comparable)Divided into two (equal) halves.
2. (not-comparable)Consisting of only one half of what the normal condition requires; having the appearance of lacking one half.

   “a dimidiate leaf, which has only one side developed”

3. (not-comparable)Having the organs of one side, or half, different in function from the corresponding organs on the other side.

   “dimidiate hermaphroditism”

verb

1. (transitive)To divide into two.

   “[…] it may be dimidiated: for instance, half a rose and half a lis being stuck together, or half a lis and half an eagle.”

2. (transitive)To represent one half of, or undergo dimidiation with.

   “[…] hybridization in the same vein is the beast shown as supporters to arms granted in 1971, where a unicorn dimidiates a lion rampant.”