a. [ L. dimidiatus, p. p. of dimidiare to halve, fr. dimidius half. See Demi-. ] 1. Divided into two equal parts; reduced to half in shape or form. [ 1913 Webster ]

2. (Biol.) (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. (b) Having the organs of one side, or half, different in function from the corresponding organs on the other side; as, dimidiate hermaphroditism. [ 1913 Webster ]

v. t. [ imp. & p. p. Dimidiated; p. pr. & vb. n. Dimidiating. ] 1. To divide into two equal parts. [ Obs. ] Cockeram. [ 1913 Webster ]

2. (Her.) To represent the half of; to halve. [ 1913 Webster ]