cinnamon fern: New World fern having woolly cinnamon-colored spore-bearing fronds in early spring later surrounded by green fronds; the early uncurling fronds are edible
fern: any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
central vein of retina: vein formed by the union of the retinal veins; accompanies central arteries of the retina in the optic nerve