turtleback

Noun

tur=tle=back

CIDE DICTIONARY

turtleback, n.

A rude stone celt of a form suggesting the back of a turtle. [Webster 1913 Suppl.]
A convex deck at the bow or stern of a vessel, so made to shed the seas quickly. [Webster 1913 Suppl.]

For further exploring for "turtleback" in Webster Dictionary Online

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