What is "universalglot"

Universalglot is an a posteriori international auxiliary language published by the French linguist Jean Pirro in 1868 in Tentative d'une langue universelle, Enseignement, grammaire, vocabulaire. Preceding Volapük by a decade and Esperanto by nearly 20 years, Universalglot has been called the first "complete auxiliary-language system based on the common elements in national languages". In his book describing his own language project Novial, Otto Jespersen praised the language, writing that it is "one to which I constantly recur with the greatest admiration, because it embodies principles which were not recognized till much later".

Pirro gave it more than 7,000 basic words and numerous prefixes, enabling the development of a very extensible vocabulary.