butterfly nut

noun

1. wing nut.

butterfly nut

noun

1. another name for wing nut

Word History and Origins

Origin of butterfly nut¹

An Americanism dating back to 1735–45

Example Sentences

Two thirds of the length was threaded and fitted with a "butterfly" nut in front of which was a cylindrical plug of guttapercha faced with indiarubber.

From Project Gutenberg

The flight-lieutenant's next move was to screw the pliable plug hard against the perforated metal by means of the "butterfly" nut, and by so doing hole No.1 was repaired—the first of six.

From Project Gutenberg