Definitions
from The Century Dictionary.
- Tending to prevent nightmare.
- noun That which prevents or is a remedy for nightmare.
- noun   Also written anti-ephialtic .
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Med.) Good against nightmare.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective medicine  Acting against nightmares .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
anti- + Ancient Greek nightmare.
			
		
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Examples
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whichbe commented on the word antephialtic
Preventing nightmares. (from Phrontistery)
May 15, 2008 
			
		
	
jmjarmstrong commented on the word antephialtic
JM dreams of antephialtic drams
December 28, 2009