from The Century Dictionary.
- Derived from or pertaining to ferns.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Chem.) Pertaining to, or derived from, ferns.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective chemistry Relating to filicic acid, derived from
from Wiktionary, Creative Commons Attribution/Share-Alike License
Each of those now particularized owes its respective usefulness chiefly to its tannin; while the few more specially endowed with healing powers yield also a peculiar chemical acid "filicic," which is fatal to worms.