From Middle English *erthfast, *erthfeste, from Old English eorþfæst (“earthfast, fixed in the earth, firm in the earth”), equivalent to earth + -fast.
"earth-fast." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/earth-fast>.
earth-fast. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/earth-fast
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