| 释义 |
polygenetic, a.|ˌpɒlɪdʒɪˈnɛtɪk|
[f. prec., after genetic.]
1. Biol. Of or pertaining to polygenesis.
1861Max Müller Sc. Lang. (1862) 348 Professor Pott, the most distinguished advocate of the polygenetic dogma, has pleaded the necessity of admitting more than one beginning for the human race and for language.
2. Geol.
a. Having more than one origin; formed in several different ways.
1873Amer. Jrnl. Sc. Ser. iii. V. 429 A composite or polygenetic range or chain, made up of two or more monogenetic ranges combined. 1889Amer. Jrnl. Sci. XXXVII. 431 The present topography..is an uncompleted advance in a second cycle of development, with recent complications by glacial action and slight changes of level. Like mountains of repeated growth, this topography may be called ‘polygenetic’. 1943Ibid. CCXLI. 486 Polygenetic complex soils and Late Quaternary alluvial bodies may preserve duplicate records of climatic changes for a given region. 1969Bennison & Wright Geol. Hist. Brit. Isles ix. 201 In the thrust block of Roman Fell, the Roman Fell Beds..rest on the Polygenetic Conglomerate of unknown age but with pebbles including andesites probably derived from the Old Red Sandstone. 1975Nature 27 Mar. 369/2 Coasts and mountains are treated separately as polygenetic landscapes, the former being the zone of contact between two distinct environments and the latter the areas within which internal uplift conflicts markedly with external erosion.
b. (See quot. 1959.) [After G. polygen in this sense (A. Stübel Die Vulkanberge von Ecuador (1897) iii. 352).]
[1903A. Geikie Text-bk. Geol. (ed. 4) I. 322 A volcano formed in this way he terms monogene; while where it has been built up by the gradual accumulations of successive eruptions he calls it polygene.] 1959A. A. G. Schieferdecker Geol. Nomencl. 239 Polygenetic volcano, formed by several volcanic outbursts. 1962E. A. Vincent tr. Rittmann's Volcanoes iii. 114 In the case of the great polygenetic volcanoes, the old topography is completely buried. 1976New Scientist 9 Sept. 527/1 Those which erupt many times are called polygenetic volcanoes.
c. Linguistics. Deriving historically from a number of sources; having more than one antecedent.
1952Archivum Linguisticum IV. 93 The outstanding trait in the history of -(i)ego..is its polygenetic character.
Hence polygeˈnetically adv., by, or in the way of, polygenesis.
1900E. R. Lankester Treat. Zool. III. 158 Eucladocrinus..was evolved polygenetically by modification of the arms. |