| 单词 |
alluvium |
| 释义 |
alluvium|əˈl(j)uːvɪəm|
Pl. alluvia, alluviums.
[a. L. alluvium neut. of adj. alluvius washed against, f. al- = ad- to + luĕre to wash.]
A deposit of earth, sand, and other transported matter left by water flowing over land not permanently submerged; chiefly applied to the deposits formed in river valleys and deltas.
1655–6Phil. Trans. I. 121 Our Earth, where Alluviums are made in some places, and the Sea gains upon the Land in others. 1731Bailey, Alluvia, little islets thrown up by the violence of the stream. 1803Syd. Smith Wks. 1859 I. 53/1 An alluvium gained and preserved from the sea. 1830Lyell Princ. Geol. I. 187 The Mississippi, by the continual shifting of its course, sweeps away..considerable tracts of alluvium. 1878Ramsay Phys. Geog. xxviii. 458 The bones of which are found in the old alluvia of rivers.
b. fig.
1850Kingsley Alt. Locke vi. (1876) 66 Out of this book alluvium a hole seemed to have been dug near the fireplace. 1862Ludlow Hist. U.S. 281 The tide of emigration..left behind it a sort of alluvium of free-soil principles. |
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