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.
This season, Vikings has remained a top 10 cable drama series. It's the top telecast on Thursdays in all key demographics when factoring in three days of DVR with an average of 4.2 million total viewers, 2.1 million adults 25-54 and 1.9 million among adults under 50.