Wiktionary:Word of the day/2021/May 31

Word of the day
for May 31
oolith n
  1. (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.
  2. (rare) Oolite.
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