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单词 sea-floor
释义

sea-floorn.

Origin: Formed within English, by compounding. Etymons: sea n., floor n.1
Etymology: < sea n. + floor n.1 Compare earlier sea-bottom n., sea-ground n.Previous versions of the OED give the stress as: ˈsea-floor.
1. The floor of the sea.
ΘΚΠ
the world > the earth > water > sea or ocean > region of sea or ocean > [noun] > sea bed
groundOE
sea-groundOE
channela1387
sea-bottoma1400
ocean bed1638
ocean floor1820
sea bed1838
ocean basin1848
ocean bottom1855
sea-floor1855
1855 C. Kingsley Glaucus 54 The variety of its rocks, aspects, and sea-floors.
1922 J. Joyce Ulysses ii. 368 On her stow he ere was living with dear wife and lovesome daughter that then over land and seafloor nine years had long outwandered.
1946 Proc. Prehistoric Soc. 12 24 The seal must have sunk in deep water and come to rest on the sea-floor.
1967 Oceanogr. & Marine Biol. 5 317 Two principal dispersal mechanisms affect shelf benthos; these are, (1) shallow seafloor connections and, (2) surface currents.
1981 London Mag. July 9 A door slams, a heavy wave, a door, the sea-floor shudders.
2. sea-floor spreading n. Geology (the hypothesis of) the formation of fresh areas of oceanic crust, occurring through the upwelling of magma at mid-ocean ridges and its subsequent outward movement on either side.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > tectonization or diastrophism > [noun] > upwelling of magma
magmatism1952
sea-floor spreading1961
pulse1964
ocean-floor spreading1965
plume1967
1961 R. S. Dietz in Nature 3 June 854/1 [The concept proposed here, which can be termed the ‘spreading sea~floor theory’, is largely intuitive, having been derived through an attempt to interpret sea-floor bathymetry.]
1961 R. S. Dietz in Nature 3 June 856/2 Sea floor spreading obviates this difficulty: continents never move through the sima.
1971 Nature 1 Jan. 9/2 The whole of geophysics has been transformed within a few years by the discovery of seafloor spreading.
1977 A. Hallam Planet Earth 42/3 If its magnetic signature allowed an age to be assigned to each piece of ocean floor, it was possible to calculate a velocity for sea-floor spreading.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2020).
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