affix

That which is affixed; an appendage.

(linguistic morphology) A bound morpheme added to the word’s stem's end.

(linguistic morphology, broadly) A bound morpheme added to a word’s stem; a prefix, suffix, etc.

(mathematics) The complex number a+bi associated with the point in the Gauss plane with coordinates (a,b).

(decorative art) Any small feature, as a figure, a flower, or the like, added for ornament to a vessel or other utensil, to an architectural feature.