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n.1.(Paleon.) The petrified fruit of the Chara hispida, a species of stonewort. See Stonewort.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Effects of light and temperature on Chara vulgaris (Charophyceae) gyrogonite productivity and polymorphism-palaeoenvironmental implications.
In the Ardanatz outcrops the micropalaeontological content is high in the intercalate marls, being dominated by foraminifera with scarce ostracods and charophyte gyrogonites (Astibia et al., 2014).
Researchers have used microscopic evidence to identify associated plant species such as gyrogonites, the fossilized female reproductive structures of some stonewort species (Detriche et al., 2009), and pollen content (Preece and Day, 1994).