a. Divided into two equal parts; reduced to half in shape or form. a. Consisting of only one half of what the normal condition requires; having the appearance of lacking one half; as, a dimidiate leaf, which has only one side developed. a. Having the organs of one side, or half, different in function from the corresponding organs on the other side; as, dimidiate hermaphroditism. v. t. To divide into two equal parts. v. t. To represent the half of; to halve.