Australian tree fern

noun

Definition of Australian tree fern

: a fast-growing tree fern (Cyathea cooperi) native to Australia that has broad, finely-divided fronds and a thin stem and that is cultivated as an ornamental His black-bottom lagoon-style pool features two 20-feet-tall Australian tree ferns nearby.— Christine Cole, Orlando Sentinel, 2 Apr. 2004 An avenue of Australian tree ferns spreads great green fronds to create a delicate pattern of light and dark over indigenous Irish ferns below.— Brian De Breffny, Architectural Digest, October 1986

First Known Use of Australian tree fern

1857, in the meaning defined above

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