adj, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A (typically beef) hamburger sandwich, whose patty weighed 1/3 of a lb (pound) before cooking.
2. 2
   Used other than figuratively or idiomatically: see third, pounder.

Adjective

1. 1
   Having the weight of 1/3 of a pound. not-comparable

Synonyms

All synonyms

third-pound

Etymology

From third + pound + -er, modelled on quarter-pounder.

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