oolith , n :
(geology) A spherical granule of which oolite is composed, formed by concentric accretion of thin layers of a mineral (usually calcium carbonate (limestone) but also others such as dolomite and silica) around a core; an ooid. (rare) Oolite.
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Robinhood Is Set to Raise at Least $200 Million in New Funding 139 by jason_zig | 150 comments on Hacker News.
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