← BackshareGuesssingle shelled/ˈsɪŋɡəl ʃɛld/adjectiveHaving only one shell or outer covering.The single-shelled peanut is easier to crack than the double-shelled variety.Some mollusks, like snails, are single-shelled creatures.The single-shelled design of the egg made it fragile.SynonymsunivalveAntonymsbivalve