The origin of the word is unclear, however, it is likely derived from Sanskrit word "markata", which denominates non-primate apes.[citation needed] In most Germanic languages monkeys are called "meercat" in accordance to that.[citation needed] (In English the meaning of meercat has changed to denominate a different animal.) According to the Online Etymology Dictionary, the word "monkey" may originate in a German version of the Reynard the Fox fable, published circa 1580. In this version of the fable, a character named Moneke is the son of Martin the Ape.[4] In English, no very clear distinction was originally made between "ape" and "monkey"; thus the 1910 Encyclopædia Britannica entry for "ape" notes that it is either a synonym for "monkey" or is used to mean a tailless humanlike primate.[5] Colloquially, the terms "monkey" and "ape" are widely used interchangeably.[6] Also, a few monkey species have the word "ape" in their common name, such as the Barbary ape. br br Later in the first half of the 20th century, the idea developed that there were trends in primate evolution and that the living members of the order could be arranged in a series, leading through "monkeys" and "apes" to humans.[7] Monkeys thus constituted a "grade" on the path to humans and were distinguished from "apes". br br Scientific classifications are now more often based on monophyletic groups, that is groups consisting of all the descendants of a common ancestor. The New World monkeys and the Old World monkeys are each monophyletic groups, but their combination is not, since it excludes hominoids (apes and humans). Thus the term "monkey" no longer refers to a recognized scientific taxon. The smallest accepted taxon which contains all the monkeys is the infraorder Simiiformes, or simians. However this also contains the hominoids (apes and humans), so that monkeys are, in terms of currently recognized taxa, non-hominoid simians. Colloquially and pop-culturally, the term is ambiguous and sometimes monkey includes non-human hominoids.[8] br br A group of monkeys may be commonly referred to as a tribe or a troop.