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nounany of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by sporestype of:
Definition that contains fern
- bracken fern of southeastern Asia; not hardy in cold temperate regions
- dryopteris fragrans fern or northern Eurasia and North America having fragrant fronds
- fragrant wood fern fern or northern Eurasia and North America having fragrant fronds
- male fern fern of North America and Europe whose rhizomes and stalks yield an oleoresin used to expel tapeworms
- black-stem spleenwort fern of tropical America: from southern United States to West Indies and Mexico to Brazil
- king fern fern of rain forests of tropical Australia and New Zealand and South Africa
- pine fern fern of Florida and West Indies and Central America with rhizome densely clad in grown hairs
- adder's tongue fern ferns with fertile spikes shaped like a snake's tongue
- polypodium glycyrrhiza fern having rootstock of a sweetish flavor
- class filicopsida ferns