Definition of "hyssop"

hyssop

/ˈhɪ.səp/

noun
countable and uncountable, plural hyssops
1. Any of several aromatic bushy herbs, of the genus Hyssopus, native to Southern Europe and once used medicinally.
  Quotations
  The life of one plant would be affected by another. Rue was definitely hostile to basil, rosemary to hyssop, but coriander, dill and chervil lived on the friendliest of terms[.]
  1940, Rosetta E. Clarkson, Green Enchantments: The Magic Spell of Gardens, The Macmillan Company, page 253
2. Any of several similar plants:
  1. Agastache foeniculum, blue giant hyssop.
3. (obsolete, US) The sagebrush (Artemisia spp.).
4. (biblical) A plant used used for sprinkling of blood or water in purification rituals and at Passover, Origanum syriacum.