Vagina. (Etymology: Though "dillus" sounds like "dill," as in a variety of pickle, and therefore a potentially good name for a penis, its usage as a term for vagina came from a spontaneous Spoonerism of the name of actress Phyllis Diller. If that Spoonerism, "Dillus Filler," was defined as a term for a penis, then "dillus" must be a word for vagina.) Refer to the example for a handy way to remember its definition.

A dillus is a very short and slender penis.