| 释义 |
concrescence|kənˈkrɛsəns|
[ad. L. concrēscentia, n. of quality f. concrēscent-em, f. con- together + crēscĕre to grow: see -ence.]
†1.
a. Growth by assimilation. Obs.
1614Raleigh Hist. World i. 11 How any other substance should thence take concrescence, it hath not been taught.
b. Biol. Coalescence or growing together of cells, organs, etc.; the coalescence of two individual organisms of low type in generation.
1878Bell Gegenbauer's Comp. Anat. 17 The Concrescence of a number of separate cells. Ibid. 87 In the Gregarinæ..multiplication commences by the concrescence of two individuals. 1888Athenæum 18 Aug. 228/2 Congenital cohesion—concrescence as Van Tieghem calls it.
c. Embryol. The growing together of two parts during the development of the vertebrate embryo.
1890C. S. Minot in Amer. Naturalist XXIV. 501 The Concrescence Theory of the Vertebrate Embryo. Ibid. 503 Concrescence in Bony Fishes. 1913J. W. Jenkinson Vert. Embryol. i. 13 Concrescence of layers, as in the union of the embryonic plate with the trophoblast in some Mammals, where the layers unite by their margins, or as in the union of the medullary folds, or of the stomodaeum with the gut, where the concrescence is by the surfaces. 1917Arey Prentiss' Textbk. Embryol. (ed. 2) 31 The primitive streak becomes highly significant when interpreted in the light of the theory of concrescence, a theory of general application in verterbate development. 1927W. Shumway Vert. Embryol. iv. 96 The theory of concrescence..has already been used to explain the closure of the blastopore. By many it has been extended to include the formation of the body, with the exception of the tail, by the coalescence of the two halves of the germ ring. 1956E. Witschi Devel. Vertebrates xiii. 200 Convergent movements of blastemic cell masses, which result in the joining of the material halves of a body or of organs, are designated as concrescence.
2. concr. A concretion. ? Obs.
1610Healey St. Aug. Citie of God 152 It rained..stones (not concrescences that might be called haile, but direct stones). 1793Smeaton Edystone L. §197 The stony concrescences..called Stalactites. |