noun
sap; tree sap
Refers to the fluid that circulates in trees and plants, such as maple sap or pine resin.
春になると、カエデの樹液を集めてメープルシロップを作ります。
In spring, we collect maple sap and make maple syrup.
松の樹液が手にべたべたとついた。
Pine sap stuck to my hands and felt sticky.
樹脂 refers to resin, a thicker, often sticky substance produced by trees, while 樹液 is the general term for sap, which can be watery or resinous.
Compound of 樹 (tree) and 液 (liquid, fluid). The reading is on'yomi for both characters.