from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. That which entangles or causes entanglement
from the GNU version of the Collaborative International Dictionary of English
- n. One that entangles.
from The Century Dictionary and Cyclopedia
- n. One who entangles.
Sorry, no etymologies found.
Then, too, beyond this cross-lexical effect, there is the adjective's quiet anagrammaticization in the immediately following line, where "silent entangler" telescopes under conversion to "listener" — sleep apostrophized as if overhearing its own wordplay.
Keats, as it happens, without mention of her "sound asleep" paradigm, Wolfson notes how, in the erotic braidwork of the next line's "Silent entangler of a beauty's tresses!"