fermium
- n a radioactive transuranic metallic element produced by bombarding plutonium with neutrons
fern
- n any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
fern rhapis
- n small graceful palm with reedlike stems and leaf bases clothed with loose coarse fibers
fern seed
- n the asexual spore of ferns that resembles dust; once thought to be seeds and to make the possessor invisible