from The Century Dictionary.
- noun An old name of the hawkweed, Hieracium, Britten and Holland, Eng. Plant Names.
Sorry, no etymologies found.
_hierax_ -- a hawk, because people in the old country once thought that birds of prey swooped earthward to sharpen their eyesight with leaves of the hawkweed, hawkbit, or speerhawk, as they are variously called.