sub-bottomn.adj.

Brit.

/ˌsʌbˈbɒtəm/, U.S.

/ˌsəbˈbɑdəm/

Origin: Formed within English, by derivation. Etymons: sub- prefix, bottom n.

Etymology: < sub- prefix + bottom n.

A. n.

Originally: a layer or structure that lies below the base, floor, or lowest point of something else. Later chiefly: spec. the rock strata beneath the sea bed.

ΚΠ

1871 Photogr. Mosaics 94 I forgot to say that I have a perforated sub-bottom to the case, through which I force steam from below.

1894 Official Gaz. (U.S. Patent Office) 4 Dec. 1233/1 In a flower-box... a bottom having perforations, flanges supporting said bottom, a concave sub bottom having a central opening [etc.].

1975 Background Papers on Seafloor Engin. (National Res. Council (U.S.). Committee on Seafloor Engin.) I. 355 The physical parameters that affect these characteristics, such as..seafloor roughness, sub-bottom stratification..temperature gradients in the sub-bottom.

2009 K. G. Foot in R. J. Beamish & B. J. Rothschild Future Fisheries Sci. in N. Amer. xviii. 313 [Acoustic methods]..can sense both organisms and their habitat, including water column, bottom, and sub-bottom.

B. adj.

Below the lowest level or bottom of something, (now esp.) below the sea bed.

ΘΚΠ

the world > the earth > water > sea or ocean > region of sea or ocean > [adjective] > under sea-bed

sub-bottom1949

1902 C. A. Bates Art & Lit. Business 370 I have seen an ad of an advertising agent who claimed to have ‘sub-bottom rates’.

1949 Trans. Amer. Geophysical Union 30 7 The most clear-cut sub-bottom echoes are found in the region which shows least topographic relief.

1968 R. W. Fairbridge Encycl. Geomorphol. 1227/2 Sub-bottom acoustic profiling..has demonstrated many wave-cut terraces partly hidden beneath a thin veneer of late Holocene sediments.

1975 Petroleum Rev. 29 103/1 Sub-bottom profiler.

2002 Colgate Scene (Colgate Univ., Hamilton, N.Y.) Jan. 2/4 The new view of the sedimentary structures and channel dynamics was made possible by bringing the latest technology in sub-bottom sonar profiling from the United States.

This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).

单词	sub-bottom
释义	sub-bottomn.adj. Brit. /ˌsʌbˈbɒtəm/, U.S. /ˌsəbˈbɑdəm/ Origin: Formed within English, by derivation. Etymons: sub- prefix, bottom n. Etymology: < sub- prefix + bottom n. A. n. Originally: a layer or structure that lies below the base, floor, or lowest point of something else. Later chiefly: spec. the rock strata beneath the sea bed. ΚΠ 1871 Photogr. Mosaics 94 I forgot to say that I have a perforated sub-bottom to the case, through which I force steam from below. 1894 Official Gaz. (U.S. Patent Office) 4 Dec. 1233/1 In a flower-box... a bottom having perforations, flanges supporting said bottom, a concave sub bottom having a central opening [etc.]. 1975 Background Papers on Seafloor Engin. (National Res. Council (U.S.). Committee on Seafloor Engin.) I. 355 The physical parameters that affect these characteristics, such as..seafloor roughness, sub-bottom stratification..temperature gradients in the sub-bottom. 2009 K. G. Foot in R. J. Beamish & B. J. Rothschild Future Fisheries Sci. in N. Amer. xviii. 313 [Acoustic methods]..can sense both organisms and their habitat, including water column, bottom, and sub-bottom. B. adj. Below the lowest level or bottom of something, (now esp.) below the sea bed. ΘΚΠ the world > the earth > water > sea or ocean > region of sea or ocean > [adjective] > under sea-bed sub-bottom1949 1902 C. A. Bates Art & Lit. Business 370 I have seen an ad of an advertising agent who claimed to have ‘sub-bottom rates’. 1949 Trans. Amer. Geophysical Union 30 7 The most clear-cut sub-bottom echoes are found in the region which shows least topographic relief. 1968 R. W. Fairbridge Encycl. Geomorphol. 1227/2 Sub-bottom acoustic profiling..has demonstrated many wave-cut terraces partly hidden beneath a thin veneer of late Holocene sediments. 1975 Petroleum Rev. 29 103/1 Sub-bottom profiler. 2002 Colgate Scene (Colgate Univ., Hamilton, N.Y.) Jan. 2/4 The new view of the sedimentary structures and channel dynamics was made possible by bringing the latest technology in sub-bottom sonar profiling from the United States. This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022). < n.adj.1871
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