moraine

American  

[muh-rayn] / məˈreɪn /

noun

1. a ridge, mound, or irregular mass of unstratified glacial drift, chiefly boulders, gravel, sand, and clay.

2. a deposit of such material left on the ground by a glacier.

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moraine British  

/ mɒˈreɪn /

noun

1. a mass of debris, carried by glaciers and forming ridges and mounds when deposited

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moraine Scientific  

/ mə-rān′ /

1. A mass of till (boulders, pebbles, sand, and mud) deposited by a glacier, often in the form of a long ridge. Moraines typically form because of the plowing effect of a moving glacier, which causes it to pick up rock fragments and sediments as it moves, and because of the periodic melting of the ice, which causes the glacier to deposit these materials during warmer intervals.

2. ◆ A moraine deposited in front of a glacier is a terminal moraine.

3. ◆ A moraine deposited along the side of a glacier is a lateral moraine.

4. ◆ A moraine deposited down the middle of a glacier is a medial moraine. Medial moraines are actually the combined lateral moraines of two glaciers that have merged.

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moraine Cultural  

1. A pile of debris, often extending for miles, deposited by a glacier. It is composed of rock fragments transported by the ice, which are left behind when the ice melts.

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Other Word Forms

• morainal
  adjective
• morainic
  adjective

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Etymology

Origin of moraine

First recorded in 1780–90; from French, from Savoyard dialect morêna “rise in the ground along the lower edge of a sloping field,” equivalent to mour(o) “mound, accumulation of earth” (from unattested murr- “mound, elevation,” apparently pre-Latin ) + -ena suffix of landforms, probably of pre-Latin origin; compare Upper Italian (Piedmont) morena “heap of organic detritus,” Spanish moreña “heap of stones, moraine”

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Example Sentences

See Examples For:

moraine

A lateral moraine, a ridge of material left along the side of a glacier, outlines the mouth.

From Science Daily ● Nov. 2, 2026

Apart from a moraine collapsing, an avalanche or an unusual amount of rainfall can destabilize a lake.

From The Wall Street Journal ● Apr. 1, 2026

A pool at the east edge of the moraine at the glacier’s bottom-fed Thielsen Creek and formed a miniature ecosystem.

From Seattle Times ● Dec. 29, 2021

Material carried by the glacier is called moraine, which is an accumulation of glacial till produced by the grinding and erosive effects of a glacier.

From Textbooks ● Jan. 1, 2017

All that one could see and feel and hear—of Icefall, moraine, avalanche, cold—was of a world not intended for human habitation.

From "Into Thin Air" by Jon Krakauer

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Related Words

• hill
• rim

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