Chondrule

n. mass of pyroxene found in meteorites

Most meteorites that fall on Earth are chondrites, which are characterized by the presence of round grains called chondrules (from Greek chondros, grain). Chondrules formed as molten or partially molten droplets in space before being accreted to their parent asteroids. Because chondrites represent the oldest solid material within our solar system and are believed to be the building blocks of the planetary system, it follows that an understanding of the formation of chondrules is important to understand the initial development of the planetary system.
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Noun
1. small granule (of e.g. chrysolite) found in some meteoric rocks
(hypernym) granule
(part-holonym) chondrite

n. chondrule, mass of pyroxene found in meteorites

(n.)
A peculiar rounded granule of some mineral, usually enstatite or chrysolite, found imbedded more or less abundantly in the mass of many meteoric stones, which are hence called chondrites.