The Latin third stem and its survival in Romance
The implications of Aronoff’s classic example of a morphome—the Latin third stem—for the history of the Romance languages are considered; the third stem is shown to persist in Romance in the form of the past participle (also, in Romanian, in the supine) and to display truly ‘morphomic’ properties in diachrony. Some criticisms of the morphomic status of the third stem in Latin are reviewed. The significance of apparent counterexamples in Portuguese and elsewhere is considered. The diachronic data disclose a probably crucial distinction between derivational and inflexional domains in the definition of morphomic patterns. Such patterns reveal themselves as robust only within inflexional morphology, and it is suggested that perfect lexical identity between alternating word forms is crucial to the existence and persistence of morphomic patterns.