Entry 1 sense Webster, 1913 Conchology · Con·chol·o·gy · IPA /kɒŋˈkɒləd͡ʒi/ 01 n. The science of Mollusca, and of the shells which they form; malacology. 1. The science of Mollusca, and of the shells which they form; malacology.(Zool.)