竜骨
りゅ
う
こ
つ
Meanings
1
The central structural beam running along the bottom of a ship or boat.
The ship's keel was made of oak.
2
dragon bone; longgu
Traditional Chinese medicine term for fossilized bone used as a crude drug; also known as Fossilia ossis mastodi.
In Kampo medicine, dragon bone is said to have a calming effect.