‖n. pl. [ NL. See Mollusk, and -oid. ] (Zool.) A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca. [ 1913 Webster ]

☞ Originally the Tunicata were included under Molluscoidea, from which they are known to differ widely in structure and embryology. Molluscoidea were formerly considered a subdivision of Mollusca, but they are now known to have more relationship with Annelida than with Mollusca. [ 1913 Webster ]