Dimidiate /(?)/

1. Divided into two equal parts; reduced to half in shape or form.
2. 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. (Biol.)

imp. & p. p. Dimidiated; p. pr. & vb. n. Dimidiating

1. To divide into two equal parts. [Obs.]
2. To represent the half of; to halve. (Her.)