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mid-ocean
[mid a.]
a. The middle of an ocean.
1697Dryden æneid i. 161 Fierce Eurus..in mid Ocean left them moor'd a-land. 1881Athenæum 15 Jan. 97/3 Very interesting is the account of the pelagic fishes, or those which inhabit the mid ocean. 1905Smart Set Sept. 116/2 It was as surely and as irrevocably lost as though it had sunk into a thousand fathoms of midocean. 1930S. Spender 20 Poems 3 Like Icarus mid-ocean-drowned. 1938Times Lit. Suppl. 3 Sept. 572/4 His repairs in mid-ocean to his small auxiliary engine.
b. attrib., esp. in mid-ocean ridge, one of the mountainous ridges, several kilometres high and over a thousand wide, that rise abruptly from the abyssal plain in the middle of each ocean basin and form a connected worldwide system, marked along much of its length by a central rift that overlies earthquake foci.
1956Geophysical Monogr. I. 75/1 Mid-ocean islands. 1961Ewing & Landisman in M. Sears Oceanogr. i. 5 The remaining 18% [of the earth's surface]..contains parts of the mid-ocean ridge system. 1963G. L. Pickard Descriptive Physical Oceanogr. ii. 10 The Mid-ocean Ridge is probably the most extensive single feature of the earth's topography. 1968M. J. Keen Introd. Marine Geol. iii. 46 The abyssal plains may be cut..by mid-ocean canyons. 1968Times 8 Oct. 7/7 Present-day oceans are marked by underwater mountain ranges, called mid-ocean ridges, along which molten material is injected upwards from the earth's mantle and spreads out on either side of the ridge. 1971J. R. Heirtzler in A. E. Maxwell Sea IV. i. iii. 99 The Red Sea..is bisected by the mid-ocean ridge which passes south through the Gulf of Aden and the Indian Ocean.
So mid-oceˈanic a.
1961Ewing & Landisman in M. Sears Oceanogr. i. 9 On every crossing the ridge has been found where it was expected, with its median rift accurately following the mid-oceanic earthquake belt. 1966R. W. Fairbridge Encycl. Oceanogr. 506 The Mid-Atlantic Ridge is that portion of the mid-oceanic ridge system which lies within the limits of the Atlantic Ocean. 1970L. R. A. Capurro Oceanogr. for Practicing Engineers vii. 139 The sea bottom can be divided into three major morphologic divisions: continental margin, ocean-basin floor, and midoceanic ridge. |