Turtleback meaning

tûr'tl-băk'
Something shaped like the back of a turtle, especially:
  • An arched structure erected over the deck of a ship as protection from heavy seas.
  • A stone tool with a convex side.
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An arched structure built over the deck of a ship as a protection against heavy seas.
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Anything having the shape of a turtle's back (that is, its shell.)
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(The addition of quotations indicative of this usage is being sought): A library binding of a mass market paperback with a generic hardcover.
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Any plant of the genus Psathyrotes of annual and perennial forbs and low subshrubs native to dry areas of southwestern North America.
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Origin of turtleback