Vasum n. : A genus including several species of large marine gastropods having massive pyriform shells, with conspicuous folds on the columella.

Example:
I'm attempting to ratify article 36a of Vasum: A Methodology for the Synthesis of Lambda Calculus?

Taxonomy
species, clade, genus, vase, free encyclopedia, shells, family, sea snails, The shells, search, tide pool, Kingdom, Phylum, unranked, Superfamily, Subfamily, Turbinellidae, Kiener.

Defination from the web:
Vasum. From Wikipedia, the free encyclopedia. Jump to: navigation, search. Vasum. Vasum rhinoceras in ... Vasum. species. See text. Vasum, common name the vase snails or vase shells, is a genus of large predatory sea snails, marine gastropod mollusks within the family Turbinellidae. ...