Abstract This paper examines the evidence for the marginal feminine endings *-ay- and *-āy- in Proto-Semitic, and the feminine endings *-e and *-a in Proto-Berber. Their similar formation ( *CV̆CC-ay/āy ), semantics (verbal abstracts, underived concrete feminine nouns) and plural morphology (replacement of the feminine suffix by a plural suffix with - w- ) suggest that this feminine formation should be reconstructed to a shared ancestor which may be called Proto-Berbero-Semitic.