Dendrology latin root

What does the root word Dendro mean?
The root “dendro-“ is from the Greek meaning “tree” and is used in compound words such as dendrochronology, or the study of tree rings for dating purposes; Liriodendron, the genus that tulip tree belongs to (Greek “lirio” meaning tulip, “dendron” meaning tree); and many other words..
Another branch of the “deru-” tree is the Greek root for “tree,” “dendron,” which gives us “dendritic” (branch-like), “rhododendron” (literally “rose tree” in Greek), “dendrology” (the study of trees, woody plants and Arnold Schwarznegger).
Dendrochronology derives from the Ancient Greek dendron (δένδρον), meaning "tree", khronos (χρόνος), meaning "time", and -logia (-λογία), "the study of".

What does the root word Dendro mean?