| Noun | 1. | hart's-tongue fern - tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotryafern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores | |
| 2. | hart's-tongue fern - Eurasian fern with simple lanceolate frondsfern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores | |
| 3. | hart's-tongue fern - common epiphytic or sometimes terrestrial fern having pale yellow-green strap-shaped leaves; Florida to West Indies and Mexico and south to Uruguaystrap fern - fern with long narrow strap-shaped leaves | |