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Particle made of quarks, 6 letters
Subatomic particle made of three quarks, 6 letters
Russian ballet star Mikhail, 11 letters
Russian dancer and choreographer who migrated to the United States (born in 1948), 11 letters
Any of several compounds of barium, 6 letters
(astronomy) the common center of mass around which two or more bodies revolve, 10 letters
The absolute unit of pressure equal to one dyne per square centimeter, 5 letters
The main source of barium, 7 letters