Senses
贞木/ 貞木 hardwood
broad-leaved wood or timber of a high density
贞木/ 貞木 principled person
(metaphorical) people of integrity, rectitude, or loyalty, especially those who remain firm in difficult times
贞木/ 貞木 pine tree
(archaic) another name for the pine tree
贞木/ 貞木 hardy tree
(literary) trees that are resilient to cold and remain evergreen throughout the winter, such as pines or cypresses