Di*mid"i*ate (?), 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.

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.

Di*mid"i*ate (?), v. t. [imp. & p. p. Dimidiated; p. pr. & vb. n. Dimidiating.] 1. To divide into two equal parts. [Obs.] Cockeram.

2. (Her.) To represent the half of; to halve.