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“marsh” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

marsh s.
palus, -ūdis, feminine (☞ stagnum is any piece of standing water; lacus, a lake, whether natural or artificial; lacuna, a pool): a lake overflowing its borders forms marshes, lacus se stagnans facit paludes.

Quick answer

What is the Latin word for marsh?
The usual Latin words for “marsh” are palūs, lacus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.