• WordNet 3.6
    • n upthrust (geology) a rise of land to a higher elevation (as in the process of mountain building)
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Century Dictionary and Cyclopedia
    • n upthrust A thrust in an upward direction; in geology, an upheaval; an uplift. A term rarely used, and then generally as meaning a thrusting or lifting upward of a mass of rock more violent in its motion and more local in character than is generally understood to be the case when the term upheaval or uplift is used. Thus, the uplift of a continent; the upthrust of a mass of eruptive or intrusive rock. Also used attributively.
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Chambers's Twentieth Century Dictionary
    • n Upthrust up′thrust a thrust upward, an upheaval of a mass of rock.
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In literature:

The man did not see him, but passed so close to the dog's hospitably upthrust nose that he all but touched it.
"Further Adventures of Lad" by Albert Payson Terhune
He pressed closer to the swayingly kneeling man, and with upthrust muzzle sought to kiss the blubbering face.
"His Dog" by Albert Payson Terhune
Rectangular, upon their outlines no spike of pyramid, no curve of globe showing, uncompromisingly ponderous, they upthrust.
"The Metal Monster" by A. Merritt
Huge stumps upthrust like beacons in a ruffled harbor, grim, massive butts.
"Big Timber" by Bertrand W. Sinclair
The tree tops, upthrusting through these banks of fog, looked like wooded islets in tiny gray lakes.
"The Young Wireless Operator--As a Fire Patrol" by Lewis E. Theiss
Acacia-trees sprout amid the monuments, and break the tablets with their thorny shoots upthrusting from the soil.
"Sketches and Studies in Italy and Greece" by John Addington Symonds
The principle of loyalty is the life-force of virtue; it is like the power that sends the tree toward the heavens, the upthrust of life.
"Religious Education in the Family" by Henry F. Cope
Acacia-trees sprout amid the monuments, and break the tablets with their thorny shoots upthrusting from the soil.
"Sketches and Studies in Italy and Greece, Complete" by John Symonds
The two men were still sitting on the logs and leaning lazily against upthrust boughs.
"The Young Trailers" by Joseph A. Altsheler
The match burned down, and dropped from his upthrust fingers.
"Phantom Wires" by Arthur Stringer
The country is rugged, broken here and there by upthrusts of gray rock.
"Followers of the Trail" by Zoe Meyer
Upthrust of the serviceable Anarchist.
"The Shadow On The Dial, and Other Essays" by Ambrose Bierce
When his presence was announced, neither the cony nor I could see him because of an intervening upthrust of rock.
"A Mountain Boyhood" by Joe Mills
The shoulder of a hill upthrust beneath the jungle.
"Astounding Stories of Super-Science, June, 1930" by Various
Once Sorenson almost had him on his knees, but by a quick powerful upthrust of his legs he regained his upright position.
"In the Shadow of the Hills" by George C. Shedd
He felt the upthrust of the R. A.
"Astounding Stories, May, 1931" by Various
There was something like defiance in that sudden upthrust.
"The Haunters of the Silences" by Charles G. D. Roberts
There was the upthrust of rock.
"Hoof and Claw" by Charles G. D. Roberts
She slapped the lovingly upthrust muzzle with all her feeble force.
"Lad: A Dog" by Albert Payson Terhune
Rather than clamber over its sodden bole, I skirted it until I could walk beneath a lank, upthrust bough.
"Memoirs of a Midget" by Walter de la Mare