Lewis & Short

molluscus, a, um, adj. [mollis].

  1. I. Soft: mollusca nux; and absol.: mollu-sca, ae, f., a kind of soft nut with a thin shell, Plaut. ap. Macr. S. 2, 14; Plin. 15, 22, 24, § 90.
  2. II. Subst.: molluscum, i, n., a fungus that grows on the maple-tree, Plin. 16, 16, 27, § 68.