This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
阺 combines the mound radical ⻖ with the phonetic component 氐. The exact historical development and original meaning are uncertain.
The mound radical ⻖ suggests a hill or slope, and 氐 might hint at a low or base area. Picture a low mound at the foot of a hill, but remember the meaning is uncertain.
For キョ, imagine a low mound that looks like a giant key: key -> キョ, and the mound is the key to the landscape.