permafrost (n.)

"subsoil frozen year-round, as in the Arctic regions," 1943, coined in English by Russian-born U.S. geologist Siemon W. Muller (1900-1970) from perm(anent) frost.

also from 1943

Trends of permafrost

adapted from books.google.com/ngrams/. Ngrams are probably unreliable.

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silo

1835, "a pit in the ground or a cavity in rock for storage of green crops," often in reference to other countries, and the word in English is explained at first, from Spanish silo, traditionally derived from Latin sirum (nominative sirus), from Greek siros "a pit to keep corn in.

soil

early 13c., "to defile or pollute with sin," from Old French soillier "to splatter with mud, to foul or make dirty," originally "to wallow" (12c., Modern French souillier), from souil "tub, wild boar's wallow, pigsty," which is from Latin solium "tub for bathing; seat" (from PIE

land

Old English lond, land, "ground, soil," also "definite portion of the earth's surface, home region of a person or a people, territory marked by political boundaries," from Proto-Germanic *landja- (source also of Old Norse, Old Frisian Dutch, Gothic land, German Land), perhaps fro

ground

Old English grund "bottom; foundation; surface of the earth," also "abyss, Hell," and "bottom of the sea" (a sense preserved in run aground), from Proto-Germanic *grundu-, which seems to have meant "deep place" (source also of Old Frisian, Old Saxon, Danish, Swedish grund, Dutch

frost

Old English forst, frost "frost, a freezing, frozen precipitation, extreme cold," from Proto-Germanic *frustaz "frost" (source also of Old Saxon, Old Frisian, Old High German frost, Middle Dutch and Dutch vorst), from the verb *freusanan "to freeze" (source of Old English freosan

deacon

Middle English deken, "one who reads the Gospel in divine worship, one of a body of assistants to a priest or other clergyman," from Old English deacon, diacon, from Late Latin diaconus, from Greek diakonos "servant of the church, religious official," literally "servant," from di

traffic

c. 1500, "trade, commerce," from French trafique (15c.), from Italian traffico (14c.), from trafficare "carry on trade," of uncertain origin, perhaps from a Vulgar Latin *transfricare "to rub across," from Latin trans "across" (see trans-) + fricare "to rub" (see friction),

tuxedo

man's evening dress for semiformal occasions, 1889, named for Tuxedo Park, N.Y., a rural resort development for wealthy New Yorkers and site of a country club where it first was worn, supposedly in 1886. The name is an attractive subject for elaborate speculation, and connections

hearse

c. 1300 (late 13c. in Anglo-Latin), "flat framework for candles, hung over a coffin," from Old French herse, formerly herce "large rake for breaking up soil, harrow; portcullis," also "large chandelier in a church," from Medieval Latin hercia, from Latin hirpicem (nominative hirp

watershed

"line separating waters flowing into different rivers," 1803, from water (n.1) + shed in a topographical sense of "ridge of high ground between two valleys or lower ground, a divide," for which see shed (n.2). Perhaps a loan-translation of German Wasser-scheide. Figurative sense

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updated on May 01, 2020

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permanence

permanent

permeability

permeable

permeant