1That has a long tail.
2Specifically in the names of animals.
Earliest in "long-tailed tit".
3 humorous Of a word: having a long ending; (more generally) long, polysyllabic. Formerly also (of a speech): †tediously long, long-winded (obsolete).
Late Middle English; earliest use found in John Mirk (fl. c1382–c1414), Augustinian author. From long + tailed.