Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An oral sedative and hypnotic drug, C17H17ClN6O3, used to treat insomnia.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The active dextrorotatory stereoisomer of zopiclone, used as a sedative to treat insomnia.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[es-, isomer pref.; see escitalopram + zopiclone, a sedative (perhaps (a)zo– + pi(perazine) + (cy)cl(o)– + –one).]

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