An oxbow lake.
Early 20th century. Probably from mort or its etymon French mort dead + lake, although perhaps influenced by the name of Mortlake in Surrey, England.
Attributive Designating a kind of tapestry woven at Mortlake under royal patronage in the reigns of James I and Charles I, originally to Flemish designs, later depicting the paintings of prominent European artists of the day (notably Raphael).
Late 17th century; earliest use found in William Wycherley (bap. 1641, d. 1716), playwright. From the name of Mortlake, a village in Surrey, England, where this kind of tapestry was woven.