Ir″ri‐tant (?), a. [LL. irritants, -antis, p. pr. of irritare to make null, fr. L. irritus void; pref. ir- not + ratus established.] (Scots Law) Rendering null and void; conditionally invalidating.
The states elected Harry, Duke of Anjou, for their king, with this clause irritant; that, if he did violate any part of his oath, the people should owe him no allegiance. Hayward.