ampulla vs flagon

ampulla

noun
  • A vessel for containing consecrated wine or oil. 

  • An Ancient Roman two-handled vessel. 

  • The spongiole of a root. 

  • The dilated end of a duct. 

flagon

noun
  • A large vessel resembling a jug, usually with a handle, lid, and spout, for serving drinks such as cider or wine at a table; specifically (Christianity), such a vessel used to hold the wine for the ritual of Holy Communion. 

  • A flagon and its contents; as much as fills such a vessel. 

How often have the words ampulla and flagon occurred in a corpus of books? (source: Google Ngram Viewer )