dimidiate

adjective (dɪˈmɪdɪɪt)

1. divided in halves
2. biology rare having one of two sides or parts less developed than the otherdimidiate antlers

verb (dɪˈmɪdɪˌeɪt)

3. (tr) heraldry to halve (two bearings) so that they can be represented on the same shield