Large __ Collider, Particle Accelerator
Puzzle 3 of Jokes and Gags Medium Pack
Question is: Large __ Collider, Particle Accelerator
and the answer is: HADRON
Word Meaning:
HADRON — (particle physics) A composite particle that comprises two or more quarks held together by the strong force and (consequently) can interact with other particles via said force; a meson or a baryon.
Definitions from Wiktionary.