眶 is a bound morpheme — you almost never see it standalone. It appears in fixed phrases, especially 热泪盈眶 (rè lèi yíng kuàng, 'hot tears fill the eyes') and 夺眶而出 (duó kuàng ér chū, 'to burst from the eyes'), both describing intense emotion.
memory
The radical 目 (mù, 'eye') on the left tells you it's eye-related; the right side 匡 (kuāng) supplies the sound. Eye + frame = the bony rim that frames the eye.
Left eye radical 目 — a vertical box with two internal bars, pictograph of an eye seen on edge. It marks 眶 as a feature of the eye, specifically the bony frame around the eyeball. Same family: 眼 eye, 睛 eyeball, 睡 sleep, 瞎 blind, 瞪 to stare.
Right 匡 supplies the sound — kuāng drifting to kuàng with a tone shift. It also contributes meaning: 匡 pictures a square frame or basket, and the eye-socket is precisely the bony frame around the eye. Same phonetic kernel: 框 picture frame, 筐 basket, 狂 wild.
