English
marshside
From marsh + side.
Proto-Indo-European *móri ‘standing water’
…
Proto-West Germanic *mari ‘sea, lake’
Proto-West Germanic *marisk ‘lake-like, marshy’
Old English mersċ ‘a marsh, bog, or swamp’
Middle English mersch ‘a region of marshland or damp meadowland’
English marsh
Proto-Germanic *sīdaz ‘drooping’
Proto-Germanic *sīdǭ ‘side’
Old English sīde ‘side’
Middle English side
English side
Today it means
adj Beside a marsh.
Language periods are conventional ranges, not dates for this word.
Etymograph / marshside