1. North American fern having tall erect pinnate fronds and a few sporogenous pinnae at or near the centre of the fertile fronds
   - interrupted fern

Type of: flowering fern, osmund

• Radhakrishnan
• radial
• radial artery
• radial asymmetry
• radial engine
• radial keratotomy
• radial nerve
• radial pulse
• radial symmetry
• radial tire
• radial tyre
• radial vein
• radial velocity
• radial-ply
• radial-ply tire
• radial-ply tyre
• radially
• radially symmetrical
• radian
• radiance
• radiancy
• radiant
• radiant energy
• radiant flux
• radiant heating