(4) The ‘morphophonemic’ system: the code which ties together the grammatical and phonological systems. - Hockett (1958), a pag.137
The ways in which the morphemes of a given language are variously represented by phonemic shapes can be regarded as a kind of code. This code is the ‘morphophonemic system’ of the language. - Hockett (1958), a pag.135