Webster's Revised Unabridged Dictionary · 1913

Dimidiate

Dimidiate , adjective

[Latin dimidiatus, past participle of dimidiare to halve, from dimidius half. See Demi-.]

1.
Divided into two equal parts; reduced to half in shape or form.
2.
(a) (Biology) 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)
(Biology) Having the organs of one side, or half, different in function from the corresponding organs on the other side; as, dimidiate hermaphroditism.

Dimidiate , transitive verb

1.
To divide into two equal parts. [Obsolete] — Cockeram
2.
(Heraldry) To represent the half of; to halve.