noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A kind of automobile muffler in which the exhaust gas passes straight through the center of the muffler. It consists of a smaller tube centered inside a larger tube that is enlarged or swollen in the middle, the gap between tubes being filled with fiberglass.

   "That's an illegal muffler, Alan thought. A glasspack. I could cite him for that."

Example

More examples

"That's an illegal muffler, Alan thought. A glasspack. I could cite him for that."

Etymology

From glass + pack.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.