Lord Nelson lord·nel·son uncommon noun 1. English admiral who defeated the French fleets of Napoleon but was mortally wounded at Trafalgar (1758-1805) SynonymsNelsonHoratio NelsonViscount NelsonAdmiral NelsonLord Nelson Related words Broader terms admiral WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.