screw anchor

noun

1

: an anchor in the form of a sharp-pointed screw with broad flanges used principally for moorings

2

: an expanding metal shell that wedges itself into a drilled hole upon insertion and is used to retain a screw in material (as concrete, brick, or tile) otherwise unsuitable

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now