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[NL., Gr. ἀστήρ, a star, + -ina.] The typical genus of starfishes of the family Asterinida. A. gibbosa is the gibbous starlet. Aster in a is a large genus, almost world-wide in its distribution. The skeleton is formed of imbricated or overlapping and notched o icula. Stand. Nat. Hist., I. 159.