In the process of analyzing a language there might be occasion to use the term 'morph' to designate a structural unit which had not yet been assigned to any morpheme; but in the description of a language (as distinct from the procedure of analyzing it) every structural element except features of arrangement is either a morpheme or part of a morpheme. Hence every element is also an allomorph or part of an allomorph.
- Nida (1948), a pag.420