An action for which a set form of words is prescribed, which must be strictly adhered to. 10 Mod. 140, 141. FORMEDON, Formdon. L. Fr. [contracted from forme de don; L. Lat. forma donationis; the form of the gift.] In old English practice. An action, in the nature of a writ of right, given by the statute Westm. 2, (13 Edw. I.) c. 1, as the peculiar remedy of a tenant in tail, in case of a discontinuance of the estate tail; and therefore called his writ of right. 3 Bl. Com. 191. Called formedon, because the writ comprehended the form of the gift. Co. Litt. 326 b. It was of three kinds, in the descender, in the remainder, and in the reverter. See infra. Writs of formedon were specific remedies to carry into effect the statute de donis, which provided quod voluntas donatoris, secundum formam in charta doni sui manifeste expressam, de cætero observetur; that the will of the donor, according to the form clearly expressed in the charter of his gift, shall in future be observed; [their object, in other words, being to enforce the gift in tail according to its form.] 2 Reeves' Hist. Eng. Law, 320. 3 Id. 41. They 3 Bl. of formedon which lay where a gift in tail was made, and the tenant in tail aliened the lands entailed, or was disseised of them, and died; in this case, the heir in tail was entitled to this writ, to recover these lands so given in tail, against him who was the actual tenant of the freehold. Com. 192. F. N. B. 211 L. 212. Roscoe's Real Act. 43, 54. Litt. sect. 595. Reg. Orig. 238 b. The form in the Register recites that the premises claimed ought to descend to the demandant per formam donationis, (by the form of the gift.) Reg. Orig. ub. sup.