An A'dditament. n.s. [additamentum, Lat.] The addition, or thing added.
Iron will not incorporate with brass, nor other metals, of itself, by simple ﬁre: so as the enquiry must be upon the calcination, and the additament, and the charge of them. Bacon.
In such a palace there is first the case or fabrick, or moles of the structure itself; and, besides that, there are certain additaments that contribute to its ornament and use; as, various furniture, rare fountains and aqueducts, curious motions of divers things appendicated to it. Hale's Origin of Mankind.