In some cases morphological elements may be coterminous with phonological elements. […] Similarly, if we include among the phonological elements those segments which represent so-called gestural and onomatopoetic sounds, and which combine only rudimentarily with other segments, we will find that these segments are in effect also morphological elements: e.g. if the tongue-tip click written 'tsk' in English is considered a phonological element of English, we will find that it is restricted to a relatively small number of social situations and meanings. In all these special cases a phonological element will be found to have high correlation with classes of social situations. More generally, we can say that every phoneme has some elementary meaning in that it differentiates one meaning-correlated morpheme from another: we can say that /t/ correlates with the meaning difference between 'short' and 'shorn', 'shore', etc., and between 'take' and 'lake', 'ache', etc., and so on.
- Harris (1951), a pag.188, n.66