1. Bright blue-green fern widely distributed especially in damp acid woodlands of temperate northern hemisphere
   - Gymnocarpium dryopteris, Thelypteris dryopteris

Derived forms: oak ferns

Type of: fern

Part of: genus Gymnocarpium, Gymnocarpium

• kneepan
• knees-up
• knell
• Knesset
• Knesseth
• knickerbocker glory
• knickerbockers
• knickers
• knickknack
• knickknackery
• knife
• knife blade
• knife fight
• knife pleat
• knife thrust
• knife-edge
• knife-handle
• knifelike
• knight
• knight bachelor
• knight banneret
• knight errantry
• Knight of the Round Table
• knight of the square flag
• Knight Templar