2. (noun) tuatua, Paphies subtriangulata - an edible bivalve mollusc found buried in fine sand near low tide level on open sandy ocean beaches throughout Aotearoa/New Zealand. The hinge of a tuatua is more sharply angled than that of a pipi.
Synonyms: tairaki, pipi tairaki, kaitua, kahitua, taiwhatiwhati