walking fernEnglishOxford New American Dictionarywalking fern /ˈwôkiNG fərn, ˈwɔkɪŋ fərn/ ▸ noun a North American fern with long slender tapering fronds that form new plantlets where the tips touch the ground, typically growing on limestone. Asplenium (or Camptosorus) rhizophyllus, family Aspleniaceae.