dimidiate
Divided into two (equal) halves.
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
Having the organs of one side, or half, different in function from the corresponding organs on the other side.
dimidiate hermaphroditism
Where it comes from
From Latin dīmidiātus, past participle of dīmidiāre (“to halve”).
Adapted from the Wiktionary entry dimidiate (CC BY-SA 4.0).