NAYWORD Meaning of NAYWORD in English ˈnāˌ ̷ ̷ nounEtymology: nay- (of unknown origin) + word 1. : a word used as a signal : watchword 1b2. obsolete : a proverb of reproach : byword Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012