Useless fact
What is the spiral part of a corkscrew called?
The spiral metal piece of a corkscrew that is inserted into the cork is called the worm.
The mechanical corkscrew was patented in 1795 by Samuel Henshall in England, though similar spiral devices had been used for decades prior to extract bullets from gun barrels and corks from bottles. From the early days of its design, the spiral-shaped metal piece that twists into the cork has been referred to by English speakers as the worm, a term likely inspired by its resemblance to a burrowing larva or a worm gear. To function effectively, the worm must be designed with a hollow center rather than a solid shaft. A solid screw would simply shred the cork, while a true hollow worm cuts a clean path through the material, securing enough grip to pull the cork out intact. Modern corkscrews often coat the worm in Teflon to reduce friction, ensuring a smoother entry and exit. Today, the term is recognized by lexicographers worldwide and is a standard industry term among vintners and sommeliers.
Why this is true — The term is defined in major dictionaries, including Merriam-Webster and Collins, as the spiral metal part of a corkscrew.
Sources
- gusano | Diccionario de la lengua española Real Academia Española