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).

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). < n.1855
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