THE paradigms that may be set up for the nominals in Tigrinya1 in terms of the category of number (established on syntactical and further morphological grounds) consist of two members, conveniently termed ‘singular’ and ‘plural’. The morphological analysis for the forms placed in this grammatical relationship may, for some of them, be given in terms of ‘external flection’ or ‘sumxation’, but for many forms, including those in commonest use, the differences of syllabic pattern, and other differences throughout the entire forms, justify the use of the traditional term ‘broken plural’. It is the purpose of this paper to make a phonological analysis to handle the morphological relation between the broken plurals and the singular forms with which they are grammatically paired.