Dictionary.com Thesaurus.com

Allen screw

American

noun

a screw turned by means of an axial hexagonal hole in its head.

Etymology

Origin of Allen screw

Formerly a trademark

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.