turtleback

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tur·tle·back

 (tûr′tl-băk′)
n.
Something shaped like the back of a turtle, especially:
a. Nautical An arched structure erected over the deck of a ship as protection from heavy seas.
b. Archaeology A stone tool with a convex side.

tur′tle·back′, tur′tle·backed′ adj.

turtleback

(ˈtɜːtəlˌbæk)
n
1. (Nautical Terms) an arched projection over the upper deck of a ship at the bow and sometimes at the stern for protection in heavy seas
2. (Archaeology) (now obsolete in archaeological usage) a crude convex stone axe

tor′toise-core`



n.
Archaeol. a stone core of the Levalloisian tradition, having a rounded top and flattish bottom and prepared so as to permit a single flake to be struck from it.
[1915–20]