The term 'longbow material' refers to the type of wood used to make a longbow. The two crossword solutions for this term are YEW (3 letters) and YEWS (4 letters). YEW is a type of evergreen tree that is native to Europe, North Africa, and parts of Asia. It is known for its strength and flexibility, making it an ideal material for longbows. Yews are also known for their slow growth rate, which makes them a valuable resource.