noun
whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs
• Syn: ↑Psilopsida, ↑class Psilopsida, ↑Psilotatae
• Hypernyms: ↑class
• Member Holonyms: ↑Pteridophyta, ↑division Pteridophyta
• Member Meronyms: ↑Psilotales, ↑order Psilotales
Useful english dictionary. 2012.