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Definition of: amphiaster
(am′fē·as′tər) noun
1. Biol. That stage of cell division in which the chromatin filaments assume a radiate appearance at each end of the nuclear spindle; also, the figure so formed.
2. Zool. A spicule with two whorls of spines connected by a vertical axis, as in certain sponges. [<NL <AMPHI- + Gk. astēr star]
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