Answer: quark

AnswerCrossword Clue
QUARK

Basic constituent of matter

QUARK

What starts each of six long Acrosses

QUARK

Elementary particle

QUARK
Fundamental particle
QUARK
"Charmed" subatomic particle
QUARKHypothetical elementary particle
QUARK"Deep Space Nine" character
QUARKSubatomic particle
QUARKSubject for Stephen Hawking
QUARKHypothetical particle
QUARKBasic particle
QUARKPhysics particle
QUARKParticle with six flavors
QUARKAccelerator creation
QUARKHypothetical particle, in physics
QUARKModern physics particle
QUARKA tiny bit strange?
QUARKProton part
QUARKTiny particle
QUARKHypothetical physics particle
QUARKParticle with a "flavor"
QUARK"Charmed" particle
QUARK"Strange" particle