Meaning

noun any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers

noun star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis

origin* From German Aster, originating as a nickname from Middle High German agelster (“a magpie”), owing to the bird being known especially in the Middle Ages for mischievous tricks. * A variant of Easter.

Etymology from Wiktionary, CC BY-SA 3.0