One of the mysteries of the English language finally explained.
1Geology. A spheroidal inclusion in an igneous rock; specifically an inclusion composed of a number of concentric layers. Compare earlier "orbicular".
2Botany. Any of the small droplets of lipid found in tapetal cells of the anther of certain plants, which are released from the cells with a covering of sporopollenin.
1930s; earliest use found in Albert Johannsen (1871–1962). From orbicular: see -cule.
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