Representación de la composición química de una sustancia mediante símbolos convencionales (letras que representan los elementos y números que indican la proporción de estos elementos). En fórmulas más desarrolladas, se pueden utilizar guiones para indicar el número de enlaces.  

  Julio Arturo Torres Jaubert 

Ensemble de symboles des éléments et de nombres entiers dénotant la composition d'une espèce chimique.  

  Miranda Joubioux (src: Petit Larousse 2004) 

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