London \Lon"don\, n. The capital city of England. [1913 Webster] {London paste} (Med.), a paste made of caustic soda and unslacked lime; -- used as a caustic to destroy tumors and other morbid enlargements. {London pride}. (Bot.) (a) A garden name for {Saxifraga umbrosa}, a hardy perennial herbaceous plant, a native of high lands in Great Britain. (b) A name anciently given to the Sweet William. --Dr. Prior. {London rocket} (Bot.), a cruciferous plant ({Sisymbrium Irio}) which sprung up in London abundantly on the ruins of the great fire of 1667. [1913 Webster]