This is the 3735th most frequent French word.
retailleau
The word "retailleau" does not exist in standard French; it might be a proper noun or a misspelling.
In this sentence, 'Retailleau' is used as a proper noun referring to a specific individual, possibly a person notable in politics.
Retailleau s'est illustré dans le domaine de la politique.
Retailleau has stood out in the field of politics.
Here, 'Retailleau' is a surname of an individual who is being addressed formally in the sentence.
Je vais rencontrer Monsieur Retailleau demain pour discuter des projets.
I will meet Mr. Retailleau tomorrow to discuss the projects.
This indicates that the word 'retailleau' is not a commonly recognized term in the French language other than as a proper noun.