somniferous
Stedman's Medical Dictionary: A Practical Medical Dictionary · 1920 · p. 32
[L. somnus, sleep, Hferre, to bring.] Somnifacient.
Bu kavram başka kaynaklarda da geçiyor
The American Illustrated Medical Dictionary (1913)
Chamber's Twientieth Century Dictionary (1908)
Nuttall's Standard Dictionary of the English Language (1890)
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