pipi Amphidesma australe, a common edible bivalve of New Zealand. It is related to but smaller than the toheroa and tuatua, and has smooth oval shells measuring up to 8 cm (3") across; It is widely consumed, although less esteemed than the New Zealand ‘cockle’ (see venus shells) which often occurs on the same sandy shores, but lower down.
The name pipi (alternatively ugari) is also used in E. and S. Australia for Plebidonax deltoides, a kind of wedge shell which reaches a length of 5–6 cm (2").