The word "sellen" may look a bit odd at first glance, but it is actually a legitimate word in the English language. Its correct pronunciation is ˈsɛlən, with the emphasis on the first syllable. "Sellen" is a transitive verb that means to sell or give away. This word comes from the Old English word "sellan" which had the same meaning. Despite its uncommon appearance, "sellen" can be found in several dictionaries, providing evidence that it is an accepted word.