pearl oyster
noun
1- a tropical marine bivalve mollusc with a ridged scaly shell, which produces pearls珠母贝, 珍珠贝。
1.1
- Genus Pinctada, family Pteriidae: several species, in particular P. margaritifera, a major source of commercial pearls.珠母贝属,珍珠贝科：数种, 尤指珠母贝, 是商用珍珠的一个主要来源。