• Webster's Revised Unabridged Dictionary
    • n Amphiaster (Biol) The achromatic figure, formed in mitotic cell-division, consisting of two asters connected by a spindle-shaped bundle of rodlike fibers diverging from each aster, and called the spindle.
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Century Dictionary and Cyclopedia
    • n amphiaster A genus of starfishes, of the family Goniasteridæ. A. insignis is a beautiful Californian species with short flat arms, flat disk, and regularly arranged spines and tessellated plates.
    • n amphiaster [lowercase] In embryology, a formation in a maturing ovum of a fusiform figure radiated at either end, thus resembling two stars joined together, whence the name. See extract.
    • n amphiaster [lowercase] A sponge-spicule consisting of a straight axis with a whorl of rays near each end.
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. 'amfi` + 'asth`r a star