Etymology
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marsh (n.)

"tract of water-soaked or partially flooded land; wet, swampy ground; piece of low ground, usually more or less wet but often nearly dry at certain seasons," Middle English mersh, from Old English mersc, merisc "marsh, swamp," from Proto-Germanic *marisko (source also of Old Frisian and Old Saxon marsk "marsh," Middle Dutch mersch, Dutch mars, German Marsch, Danish marsk), probably from Proto-Germanic *mari- "sea" (from PIE root *mori- "body of water").

The vowel shift from -e- to -a- began in 15c. and is usual for -er- followed by a consonant: Compare darling (Middle English dereling, Old English deorling), far (Middle English fer, Old English feorr), mar (Middle English merren), hart (Middle English hert, Old English heorot). Marsh gas "methane generated by decaying matter in marshes" is attested by 1819.

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salt-marsh (n.)

"salt-water marshland," Old English sealtne mersc; see salt (n.) + marsh

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marshland (n.)

"a marshy district," Old English mersclond; see marsh + land (n.).

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marshy (adj.)

"of the nature of a marsh, swampy," late 14c., mershi, from marsh + -y (2). Related: Marshiness.

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marish (n.)
"a marsh," early 14c., mares, from Old French marois "marshland, bog" (12c., Modern French marais), from Frankish *marisk or some other Germanic source akin to marsh.
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marshmallow (n.)

Old English mersc-mealwe "kind of mallow plant (Althea officinalis) which grows near salt marshes;" from marsh + mallow. The confection (so called from 1877) originally was made from paste from the mucilaginous roots of this plant. The Greek word for the shrub, althaea, is from althein, althainein "to heal, get well" (the roots were used medicinally), from PIE root *al- (2) "to grow, nourish."

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hart (n.)

Middle English hert, from Old English heorot "hart, stag, male of the red deer," from Proto-Germanic *herutaz (source also of Old Saxon hirot, Old Frisian and Dutch hert "stag, deer," Old High German hiruz, Old Norse hjörtr, German Hirsch "deer, stag, hart"), perhaps from PIE *keru-, extended form of root *ker- (1) "horn; head." For vowel change, see marsh.

In later times, a male deer after its fifth year, when the crown antler has appeared. The female is a hind (n.).

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darling (n.)

Middle English dereling, from Old English deorling, dyrling "one who is much beloved, a favorite," double diminutive of deor "dear" (see dear (adj.)). The vowel shift from -e- to -a- (16c.) is usual for -er- followed by a consonant (see marsh).

As an adjective "very dear, particularly beloved," from 1590s; in affected use, "sweetly charming" (1805). "It is better to be An olde mans derlyng, than a yong mans werlyng" (1562).

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mar (v.)

Middle English merren "to deface, disfigure; impair in form or substance" (early 13c.), from Old English merran (Anglian), mierran (West Saxon) "to waste, spoil," from Proto-Germanic *marzjan (source also of Old Frisian meria, Old High German marren "to hinder, obstruct," Gothic marzjan "to hinder, offend"), from PIE root *mers- "to trouble, confuse" (source also of Sanskrit mrsyate "forgets, neglects," Lithuanian miršti "to forget"). For vowel change, see marsh. Related: Marred; marring.

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*mori- 

Proto-Indo-European root meaning "body of water."

It forms all or part of: aquamarine; Armorica; beche-de-mer; cormorant; mare (n.2) "broad, dark areas of the moon;" marina; marinate; marine; mariner; maritime; marsh; mere (n.1) "lake, pool;" Merlin; mermaid; merman; meerschaum; meerkat; morass; Muriel; rosemary; submarine; ultramarine; Weimar.

It is the hypothetical source of/evidence for its existence is provided by: Latin mare; Old Church Slavonic morje, Russian more, Lithuanian marės, Old Irish muir, Welsh mor "sea;" Old English mere "sea, ocean; lake, pool," German Meer "sea."

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