In petrology, spherulites t are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone and rhyolite as globules about the size of millet seed or rice grain, with a duller luster than the surrounding glassy base of the rock, and when they are examined with a lens they prove t...
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http://en.wikipedia.org/wiki/Spherulite
[polymer physics] In polymer physics, spherulites (from Greek sphaira = ball and lithos = stone) are spherical semicrystalline regions inside non-branched linear polymers. Their formation is associated with crystallization of polymers from the melt and is controlled by several parameters such as the number of nucleation sites, structure of ...
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http://en.wikipedia.org/wiki/Spherulite_(polymer_physics)
• (n.) A minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone.
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http://thinkexist.com/dictionary/meaning/spherulite/
(from the article `igneous rock`) Spherulites are light-coloured subspherical masses that commonly consist of tiny fibres and plates of alkali feldspar radiating outward from a ...
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http://www.britannica.com/eb/a-z/s/139
Spher'u·lite noun [ Confer French
sphérulite .]
(Min.) A minute spherical crystalline body having a radiated structure, observed in some vitreous volcanic rocks, as obsidian and pearlstone.
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http://www.encyclo.co.uk/webster/S/162
spheroidal masses typically made up of units or complexes that radiate from the center of the mass so that sections through the center resemble spoked wheels.
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https://www.encyclo.co.uk/local/20132
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