mid-14c., "hammered, beaten out or shaped with a hammer," from Old French ductile or directly from Latin ductilis "that may be led or drawn," from past participle of ducere "to lead" (from PIE root *deuk- "to lead"). From 1560s as "flexible, pliable;" 1620s as "capable of being drawn out in wires or threads." Of persons, "capable of being led or drawn," 1620s. Related: Ductility.
also destrer, "riding horse of a noble breed, war horse," c. 1300, from Old French destrer, destrier (12c.), from Vulgar Latin *dextrarius "led by the right hand," from Latin dextra, fem. of dexter "right (hand)" (from PIE root *deks- "right; south"). So called because it was led at the right hand until wanted in battle. The spelling destrer was usual in Middle English; destrier was used later, in deliberately archaic or historic contexts.
strait and sea between Alaska and Siberia, named for Danish explorer Vitus Bering, who worked for Peter the Great and led the first European expedition to sight Alaska, in 1741.