cauda noun2 •A diacritical mark with various forms, attached to the e of the e caudata used to indicate an abbreviation of ae or sometimes of oe, sometimes used on another letter when the e is omitted.The cauda of the e-caudata is extended. Ligatures of -st, -rt, -et and -nt are used. — 2010 •Ellipsis of cauda equina. formscaudae