Pronunciation: (his'up),[key] —n. 1. any of several aromatic herbs belonging to the genus Hyssopus, of the mint family, esp. H. officinalis, native to Europe, having clusters of small blue flowers.
2. any of several related or similar plants, esp. of the genera Agastache or Gratiola. 3. Bible.a plant, perhaps the origan, whose twigs were used in ceremonial sprinkling.