1. Tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotrya
   - hart's-tongue, hart's-tongue fern, Olfersia cervina, Polybotria cervina

Type of: fern

• founding
• founding father
• foundling
• foundling hospital
• foundress
• foundry
• foundry proof
• fount
• fountain
• fountain grass
• Fountain of Youth
• fountain pen
• fountainhead
• Fouquieria
• Fouquieria columnaris
• Fouquieria splendens
• Fouquieriaceae
• four
• four flush
• Four Horsemen
• Four Hundred
• four o'clock
• four times
• four-card monte
• four-centered arch