second wind: the return of relatively easy breathing after initial exhaustion during continuous exertion
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
heliobacter pylori: the type species of genus Heliobacter; produces urease and is associated with several gastroduodenal diseases (including gastritis and gastric ulcers and duodenal ulcers and other peptic ulcers)