Also 6 extrution. [f. as if ad. L. *extrūsiōn-em, n. of action f. extrūdĕre: see EXTRUDE.] The action of extruding or thrusting out; the fact of being extruded.
1. In physical sense: a. The action of pushing out; expulsion by mechanical force. b. Protrusion from within an envelope; the putting forth (e.g., of a bud or branch, an eruption, etc.).
1638. W. R[awley], trans. Bacon’s Life & Death, 84. In all Alimentation, or Nourishment, there is a two-fold Action; Extrusion, and Attraction.
1684. T. Burnet, Th. Earth, I. 30. A violent depression of some parts of the earth, and an extrusion and elevation of others.
1839. Murchison, Silur. Syst., I. xxxii. 436. This extrusion had been brought about by a succession of small upcasts.
1875. H. C. Wood, Therap. (1879), 66. The extrusion of white blood-cells in the frog’s mesentery.
2. Expulsion by violent or rigorous measures from an abode, place, position of privilege, etc.
1540. Wyatt, Lett. to Cromwell, Wks. 1816, II. 394. The treaties shall be followed to the extrusion from all their dominions.
1593. Tell-Trothe’s N. Y. Gift, 37. An vnkind extrution … of her out of dores.
1650. R. Hollingworth, Exerc. conc. Usurped Powers, 11. Meer forcible extrusion deprives not any lawfull Magistrate of his right.
1736. S. Sleech, in Lett. Lit. Men (Camden), 365. An unjust … Extrusion from his College.
1780. Johnson, L. P., Congreve, Wks. III. 163. Upon the extrusion of the Whigs, some intercession was used lest Congreve should be displaced.
1875. Merivale, Gen. Hist. Rome, lxxix. (1877), 675. The extrusion of the people from the interior of the city had diffused them over the exterior hills.
1885. Manch. Exam., 10 March, 5/2. The extrusion of the hereditary principle.
