One of the mysteries of the English language finally explained.
Originally: = "radiolarian" (obsolete). Later: specifically of, relating to, or designating radiolarians of the class Polycystinea, whose central capsule surrounding the nucleus has many evenly spaced perforations.
Originally: = "radiolarian" (obsolete). Later: specifically a radiolarian of the class Polycystinea.
Mid 19th century. From scientific Latin Polycystina (or later Polycystinea), group name from poly- + ancient Greek κύστις bladder + scientific Latin -ina (or -inea): see -ine.
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