Noun aster has 2 senses

• aster(n = noun.plant) - any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers;
is a kind of flower
is a member of genus aster
has particulars: wood aster, aster acuminatus, whorled aster, aster arenosus, heath aster, aster dumosus, bushy aster, aster ericoides, heath aster, aster falcatus, white prairie aster, aster linarifolius, stiff aster, aster linosyris, goldilocks, goldilocks aster, linosyris vulgaris, aster novae-angliae, new england aster, aster novi-belgii, michaelmas daisy, new york aster, aster ptarmicoides, upland white aster, aster shortii, short's aster, aster tripolium, sea aster, sea starwort, aster turbinellis, prairie aster, annual salt-marsh aster, aromatic aster, arrow leaved aster, azure aster, bog aster, crooked-stemmed aster, eastern silvery aster, flat-topped white aster, late purple aster, panicled aster, perennial salt marsh aster, purple-stemmed aster, rough-leaved aster, rush aster, schreiber's aster, small white aster, smooth aster, southern aster, calico aster, starved aster, tradescant's aster, wavy-leaved aster, western silvery aster, willow aster

• aster(n = noun.body) - star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis;
is a kind of anatomical structure, bodily structure, body structure, complex body part, structure