Leaf. A leaf is an organ of a vascular plant, as defined in botanical terms, and in particular in plant morphology. Foliage is a mass noun that refers to leaves as a feature of plants.eaf (noun). something which is like a leaf in being wide and thin and having a flat surface, or in being attached to a larger body by one edge or end; as : (a) A part of a book or folded sheet containing two pages upon its opposite sides.
Production on Vikings season 4 is set to begin this spring in Ireland (presumably for an early 2016 premiere), while its third season will wrap up in about a month, on April 23rd.
It premiered on March 3, 2013. On March 25, 2014, History renewed Vikings for a third season of 10 episodes, which premiered on February 19, 2015. On March 26, 2015, History renewed Vikings for an extended fourth season of 20 episodes.As of April 23, 2015, 29 episodes of Vikings have aired, concluding the third season.n March 26, 2015, History renewed Vikings for an extended fourth season of 20 episodes. As of April 23, 2015, 29 episodes of Vikings have aired, concluding the third season.