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• TREE FERN (noun) The noun TREE FERN has 1 sense: 1. any of numerous usually tropical ferns having a thick woody stem or caudex and a crown of large fronds; found especially in Australia and New Zealand; chiefly of the families Cyatheaceae and Marattiaceae but some from Polypodiaceae Familiarity information: TREE FERN used as a noun is very rare.
