| 释义 |
exogenous, a.|ɛkˈsɒdʒɪnəs|
[f. mod.L. exōgen-a, -us (see exogen) + -ous.]
a. Bot. Growing by additions on the outside; of the nature of an exogen; pertaining to or characteristic of the exogens.
b. Path. and Psychiatry. = exogenetic.
c. Anat. Of a portion of bone (see quot. 1854); opposed to autogenous.
a.1830Lindley Nat. Syst. Bot. Introd. 19 A section of the trunk of an Exogenous plant exhibits bark on the outside. 1833Lyell Princ. Geol. III. 98 There is a considerable analogy between the mode of increase of a volcanic cone and that of trees of exogenous growth. 1872M. Macmillan True Vine iii. 76 As examples of exogenous plants may be mentioned the oak..the apple..and the rose.
fig.1874Mrs. Whitney We Girls ix. 191, I am going to try if one little bit of social life cannot be exogenous. 1885Mrs. E. Lynn Linton Stabbed in Dark iv. 40 [He had] a more exogenous nature than had the other; a nature which lived more on, and adopted more from, externals.
b.1883Fortn. Rev. 1 Aug. 177 An exogenous contagion is one that depends for its potency upon favouring conditions outside the body. 1925,1962[see endogenous a. e].
c.1854Owen in Circ. Sc. (c. 1865) II. 48/2 Parts that grow out from previously ossified parts are called ‘exogenous’.
d. Geol. Formed or occurring outside some structure or mass of rock (specified or understood); spec. = exogenetic a. 2 b.
1845,1890[see endogenous a. d]. 1888[see exomorphic s.v. exo-]. 1905J. Geikie Struct. & Field Geol. xiv. 204 Exogenous or intrusive veins.—These are simply protrusions proceeding from a mass of granite into the contiguous rocks. 1933R. A. Daly Igneous Rocks & Depths of Earth viii. 150 Originating within the crater, all of these young bodies may be described as endogenous domes and are thus distinguished from the vastly bigger exogenous domes of the Mauna Loa or Icelandic type. 1954W. D. Thornbury Princ. Geomorphol. iii. 34 The agencies thus far mentioned and the processes performed by them originate outside the earth's crust, and..have been designated by Lawson as epigene and by Penck as exogenous. 1968R. W. Fairbridge Encycl. Geomorphol. 209/1 Rittmann (1962) refers to the volcanoes that build up from simple surface flows and cinders as exogenous cones and those that freeze over readily (the viscous ones) and push up from the inside as endogenous domes.
Hence eˈxogenously adv.
1879Spectator 6 Sept. 1125/1 Why should it [the Temple] not grow exogenously, building not towards the inside, but the outside? 1890Williamson in Nature 17 Apr. 573 The former of these plants possessed a highly organized, exogenously developed xylem zone. |