turtleback

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.

A West Indian helmet-shell, Cassis tuberosa.

Something having the shape of a turtle’s back.

An arched protection erected over the upper deck of a steamer at the bow, and often at the stern also, to guard against damage from the breaking on board of heavy seas; a whaleback.

In mech.: A name given to rounded formations suggesting the carapace of the tortoise or turtle.

A rounded-back cover of any structure, as over the rear of a motorcar whose frame is designed for the rear seats of the tonneau construction, but in which only two front seats are installed.

See the extract.