outer edge; brink
Refers to the outermost part or boundary of something, often used in a physical or metaphorical sense.
New residential areas are spreading on the outskirts of the city.
He is on the brink of bankruptcy.
trans-Neptunian object; TNO
Compound of 外 (outside) and 縁 (edge, rim). The exact historical derivation is uncertain, but the kanji composition transparently reflects the meaning.