heartburn What is the Definition of heartburn?Noun:a painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus) Other meanings of heartburn (synonyms, cognates). ENRU heartburn изжога Frequently viewed: lead meaningrarely definitioncertainly in a sentencedefinition of importancedefinition of unfortunatelystore meaningpill meaningeat definitioncloud definitionsmart meaningunused in a sentencenotation in a sentence A B C D E F G H I J K L M N O P Q R S T U V W X Y Z