meridian (traditional Chinese medicine)
Technical term in traditional Chinese medicine and acupuncture, referring to the pathways through which qi flows.
In acupuncture, it is considered important to regulate the flow of the meridians.
thread of connection; chain of reasoning
Figurative use, often in formal or literary contexts, to describe a logical or conceptual link between ideas or events.
His argument has a clear chain of reasoning and is easy to understand.