Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
TWL06 (NASPA List 2006)
"Wingnut" Definition
noun
A deciduous tree of the genus Pterocarya native to Asia.
Source: Wiktionary
A derogatory term for anyone perceived as odd, eccentric, and/or extreme.
Source: Wiktionary
A nut having wing-like projections so that it can be turned easily by hand.
Source: Wiktionary
A person who is politically very right-wing or left-wing, more often right wing as left wing people are called moonbat.
Source: Wiktionary
Air Force personnel in towns that host a USAF installation.
Source: Wiktionary
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