Noun zinnia has 1 sense
  1. zinnia, old maid, old maid flower - any of various plants of the genus Zinnia cultivated for their variously and brightly colored flower heads
    --1 is a kind of flower
    --1 is a member of genus Zinnia
    --1 has particulars:
     white zinnia, Zinnia acerosa; little golden zinnia, Zinnia grandiflora