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The Clue
Up and down (6 letter answer)
The Answer
QUARKS
Tags
Notes
The answer QUARKS is so rare that it appears less than once every 2500 puzzles.
Definition
QUARK as a noun:
1. (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3; "quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally"
2. (quark cheese, quark) = fresh unripened cheese of a smooth texture made from pasteurized milk, a starter, and rennet