• marsch, marsh, merche, mersch, mersh, mershe, merss
• (early) mersc

From Old English merisċ, mersċ, in turn from Proto-West Germanic *marisk; equivalent to mere (“sea”) +‎ -yssh. Doublet of mareys.

• IPA^(key): /mɛrʃ/, /marʃ/

merssh (uncountable)

1. A region of marshland or damp meadowland.
2. A marsh or damp meadow.

• mersshy

• English: marsh, merse
• Scots: mersk, merse

• “mersh, n.”, in MED Online, Ann Arbor, Mich.: University of Michigan, 2007.