Each entry gives the term in traditional and simplified form, its pinyin, the senses it carries in the classical corpus, the passages where it does real work, and how published translations have rendered it.
jīng
The stored, refined reserve of the body: slow to build, quickly spent. In this chapter it is what the intemperate exhaust through desire — a quantity that can run down, which is exactly why regimen matters.
jū
The seat — the part one sits on, and the older form of 居. Chapter 41 names it twice: in the first entry the pain draws up through the seat, and in the last the needle goes where the lower back and the seat meet.
jué yīn
The third of the three yin, and the closed. It lies before lesser yin and roots at Dadun on the great toe. The chapter calls it both 'the yin that cuts off yang' and 'the ultimate yin' — the last of the yin, where yang returns.
jù yáng
This chapter's name for the greater yang channel. On the foot it is the bladder channel, on the hand the small intestine channel — exactly what chapters six and seven call 太陽. 王冰：足少陰，腎脈。巨陽，膀胱脈。The name matters because of the route: the bladder channel runs to the crown, which is why a crown disease is faulted there, and why the chapter can say the fault is in 足少陰、巨陽 in one breath.
jī guān
The joints understood as working parts — a mechanism that fires and a gate that opens. Chapter 45 uses it once, in the lesser yang entry, and means all of it: whatever lets the back bend and the nape turn.