根瘤菌属

• 木(tree; wood)RADICAL
• 艮(firm; stop)PHONETIC

A tree's root is the hard, solid wood that lies deep underground and never moves.

• 尸(corpse; dead body lying down)RADICAL
• 禹(name of King Vũ (sound))PHONETIC

Belonging to someone like a corpse lying under the control of King Yu, unable to escape.