The word "hypnal" is often misspelled as "hypnol", which is incorrect. The correct spelling is "hypnal", with a silent "o". The word is pronounced /ˈhɪpnəl/, with the stress on the first syllable. The word is used to describe something related to sleep, such as a hypnal room or hypnal drugs. It is important to use the correct spelling and pronunciation of words to avoid confusion and miscommunication.
Monochlorantipyrine, chloral-antipyrine, a compound of chloral and antipyrine; sedative and hypnotic in doses of gr. 10-15 (0.6-1.0).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.