The term 'Turpentine Source' is composed of three crossword solutions: RESIN (5 letters), PINE (4 letters), and SLASHPINE (9 letters). RESIN is a sticky, yellowish-brown substance that is secreted by certain trees and plants. PINE is a type of evergreen tree with needle-like leaves and woody cones. Slashpine is a species of PINE tree that is native to the southeastern United States and is often used for timber and paper production. Together, these three solutions form the term 'Turpentine Source, ' which refers to the RESIN produced by certain species of PINE trees, such as slashpine, which is used to make turpentine.