ostran is incorrectly written, and should be written as "oysters" being its meaning:
ostran = ostrasOstrea is a genus of marine bivalve molluscs of the order Ostreoida, popularly known as oysters. They have two valves almost circular and unequal, and are considered to be one of the most popular edible seafood. Includes several species, being Ostrea edulis, the most well known. Some species are capable of producing pearls in the course of time, which are formed from particles that settle in the oyster, eventually forming a precious stone; There are different types of Pearl depending on the accumulated sediment.
