M'ARTINGAL, noun 1. A strap or thong fastened to the girth under a horse's belly, and at the other end to the muss-roll, passing between the fore legs. 2. In ships, a rope extending from the jibboom, to the end of a bumpkin under the cap of the bowsprit.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI