Charles Virmaître was a French lexicographer and writer, best known for his contributions to the study of slang and colloquial language in the late 19th century. His most notable work, 'Dictionnaire D'argot Fin-De-Siècle,' published in 1886, provided an extensive compilation of the slang and jargon used in Paris during that era. This dictionary not only captured the vibrant linguistic culture of the time but also served as a valuable resource for understanding the social dynamics and subcultures of fin-de-siècle France. Virmaître's work is significant for its role in documenting the evolution of the French language, particularly in how it reflects the lives and experiences of the lower classes and marginalized groups. By focusing on argot, or slang, he highlighted the richness of everyday speech and its importance in literature and society. His contributions have influenced subsequent studies of language and culture, making him an important figure in the field of lexicography and social linguistics. Through his dedication to capturing the nuances of language, Virmaître left a lasting legacy that continues to inform our understanding of linguistic diversity in France.