martingale /märˈtin-gāl/

1. A strap passing between a horse's forelegs, fastened to the girth and to the bit, noseband or reins, to keep its head down
2. A short spar under the bowsprit (nautical)
3. (in gambling) the policy of doubling the stake on losing

• rare bird
• rare birds
• rarebit
• rarebits
• rare earth
• rare-earth element
• rare earths
• raree-show
• raree-shows
• rarefaction
• rarefactions
• rarefactive
• rarefiable
• rarefied
• rarefies
• rarefy
• rarefying
• rare gas
• rare groove
• rarely
• rareness
• rarenesses
• rarer
• rare-ripe
• rarest