The word 'esker' is a loan word from Gaelic 'eiscir'

'Esker' is a word borrowed from Gaelic 'eiscir'. The word entered the English language some time around 1848.

esker [noun] [1848]

A long narrow ridge or mound of sand, gravel, and boulders deposited by a stream flowing on, within, or beneath a stagn...

See 'esker' on the Loan Words Map

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Etymology: Irish 'eiscir' ridge

See more loan words from 1800s.