The study of trees is a field of science that encompasses three distinct disciplines: dendrology (10 letters), geneology (9 letters), and silvics (7 letters). Dendrology is the scientific study of trees, including their structure, growth, diseases, and identification. Geneology is the study of the origin and development of trees, including their genetic makeup. Silvics is the study of the ecology and management of forests, including the interactions between trees and their environment. All three disciplines are essential for understanding the complex relationships between trees and their environment.