Prolix

Prolix \PRO-liks\ or \pro-LIKS\ , adjective;
1. Extending to a great length; unnecessarily long; wordy
2. Tending to speak or write at excessive length

This word dates to the early 15th century from Old French prolixe, which derives from Latin prolixus. The second part of prolixus comes from the base of liquere, which means "to flow," and the prefix pro- means "forth."
Liquere is the forebear of liquid via Latin liquidus and Old French liquide. Liquid in English dates to the late 14th century.

Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Saturday, March 12
Etymologies come from the Oxford English Dictionary and/or Etymonline.com